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Recognition of same-sex unions in Japan
Same-sex marriage is not recognized in Japan. Several municipalities and prefectures of Japan issue same-sex partnership certificates which provide some benefits but do not offer any legal recognition. Most polls conducted since 2013 have found that a majority of Japanese people support the legalization of same-sex marriage or partnerships, and a 2018 poll found it supported by an overwhelming majority of those under age 60.
On 17 March 2021, a district court in Sapporo ruled that the law banning same-sex marriage is unconstitutional. The court ruled that laws or regulations that deprive same-sex couples of the legal benefits of marriage constitute "discriminatory treatment without a rational basis" and as such violate Article 14 of the Constitution of Japan. The court also ruled that Article 24 of the Constitution, which defines marriage as "based only on the mutual consent of both sexes", does not prohibit the recognition of same-sex marriages. While the ruling did not legalise same-sex marriage in Japan, it may step up pressure on the National Diet to act.
Partnership certification system
As of 1 June 2021, 103 municipalities and three prefectures have established a "partnership oath system" (Japanese: パートナーシップ宣誓制度, pātonāshippu sensei seido [paːtonaːɕippɯᵝ seɴseː seːdo]), also known as "partnership certification system" (パートナーシップ証明制度, pātonāshippu shōmei seido), which provides same-sex couples with some limited benefits. The couple is issued a special certificate which may be useful in matters such as housing, hospital visitation rights and consenting to surgery for a partner. However, the system is not legally binding and there is no legal obligation on landlords or hospitals to honour the couples' rights even if presented with a certificate, though cities have encouraged companies, hospitals and landlords to recognize the certificate. The various benefits provided by the system are also very limited in comparison to those granted to married couples; same-sex couples cannot inherit the estate and property of a deceased partner or attend the funeral of a deceased partner for instance. Partners must meet certain requirements, including living in the municipality or prefecture, being older than 20 years of age, and not having a spouse or another partner. 3 municipalities have also established a "partnership family system" (パートナーシップ・ファミリーシップ制度, pātonāshippu famirīshippu seido). This system also recognises the children of same-sex couples, and allows them to make medical decisions for a child, and to pick up their children at schools and kindergartens (whereas previously only the biological parent was allowed to pick up the child). The first to establish this system was Akashi, Hyōgo in January 2021 followed by Tokushima in February 2021 and Adachi, Tokyo in April 2021.
On April 1, 2015, Shibuya in central Tokyo announced it would offer same-sex couples special "partnership certificates". While these licenses are not legally recognized as marriage certificates, they may be used in civil matters such as hospital visitation rights and housing. The Shibuya city office began accepting applications on 28 October 2015. In response to this action by the Shibuya city office, the "Special Committee to Protect Family Ties" (家族の絆を守る特命委員会, kazoku no kizuna wo mamoru tokumei iinkai) of the federal ruling Liberal Democratic Party was formed in March 2015 to discuss the matter. An officer from the Ministry of Justice who was invited to comment stated that the action by Shibuya is legal because the certificate issued is not a marriage certificate and the current Japanese legal code does not prohibit the "partnership" of same-sex couples.
In July 2015, Tokyo's Setagaya Ward announced it would join Shibuya in issuing partnership certificates from 5 November that year. In November 2015, the special city of Takarazuka announced it would issue partnership certificates to same-sex couples beginning on 1 June 2016. In December 2015, the city of Iga in Mie Prefecture made a similar announcement, with certificates starting on 1 April 2016. On 22 February 2016, Naha, the capital of Okinawa Prefecture, announced it would begin issuing partnership certificates to same-sex couples on 8 July 2016.
In April 2016, an LGBT rights group began a campaign for the official recognition of same-sex couples in Sapporo, the capital of Hokkaido Prefecture. The group took its petition to the Sapporo City Government in June 2016. In December 2016, officials announced that Sapporo planned to draw up guidelines by March 2017. In March, the City Government announced that partnership certificates would be issued to couples beginning on 1 June 2017. While the certificates hold no legal meaning, some insurance companies use them to allow same-sex partners to be added as beneficiaries. According to the city, about 1,500 people expressed opinions welcoming the program, while some opposed it. Sapporo became the first designated city in Japan to establish a partnership system. On 14 February 2018, the Fukuoka city office announced plans to start issuing partnership certificates to same-sex and different-sex couples from 2 April 2018. Osaka followed suit on 9 July 2018, and Chiba on 29 January 2019. Tokyo's Nakano Ward began offering partnership certificates in August 2018. Couples can receive notarized documentation recognizing a delegation agreement for medical treatment and nursing care, property management and other areas in which married couples share responsibility. The town of Ōizumi in Gunma Prefecture began issuing partnership certificates on 1 January 2019.
On 1 April 2019, the municipalities of Edogawa, Fuchū, Hirakata, Kumamoto, Odawara, Sakai, Sōja, Toshima, and Yokosuka established a same-sex partnership system. The city of Hida also planned to start issuing certificates that same day, however, this was postponed to an unspecificed date. Kanuma, and Miyazaki began issuing partnership certificates on 3 June and 10 June 2019, respectively, while Kitakyushu began doing so on 1 July, Nishio on 1 September, Nagasaki on 2 September, Sanda on 11 October, Katano on 22 November, Yokohama on 2 December, and Daitō and Kamakura on 4 December 2019.
On 1 January 2020, Mitoyo began issuing partnership certificates, followed by Amagasaki on 6 January. On 1 April 2020, 13 municipalities throughout Japan began issuing partnership certificates to same-sex couples. These are the designated cities of Hamamatsu, Niigata, Sagamihara, and Saitama, as well as the cities of Koga, Nara, Takamatsu, Tokushima, Yamatokōriyama, and Zushi, and the town of Kijō. Two special wards of Tokyo, namely Minato and Bunkyō, also started issuing certificates. Kawagoe and Toyoake followed suit on 1 May, Itami on 15 May, Ashiya on 17 May, Kawasaki, Okayama, Hayama, Tondabayashi, and Inabe on 1 July, Kawanishi on 1 August, and Kaizuka on 1 September 2020.
Kyoto began issuing partnership certificates on 1 September 2020. To be eligible for the scheme, both partners must be legal adults, one or both must be residents of the city of Kyoto, and neither can be married nor in a partnership with another individual. Although the oath does not provide any legal benefits, it does make the couples eligible for living in city-managed housing, and employers can consider the partner under those who can receive benefit payments. The city of Sakado followed suit on 1 October, Koganei on 20 October, Kitamoto, Matsudo, and Tochigi on 1 November, Kokubunji on 15 November, Kōnosu on 1 December, Hirosaki on 10 December, and Shibukawa on 21 December.
Higashikagawa, Miura and Yoshinogawa established a partnership system on 1 January 2021, and the designated city of Hiroshima did so on 4 January. Akashi began a "partnership family system" on 8 January 2021. The system allows same-sex couples to move into municipal housing, be buried together in municipal cemeteries, be labelled "relatives" rather than "roommates" on residence certificates, make medical decisions for a partner or a child, and allows same-sex couples to pick up their children at schools and kindergartens. Kōchi, and Okegawa began a partnership system on 1 February, followed by Kameoka, and Ina on 1 March, and Ageo on 16 March 2021. On 1 April 2021, 24 jurisdictions began issuing partnerships certificates. These are the Tokyo ward of Adachi, the cities of Annaka, Chigasaki, Fuji, Fujisawa, Gyōda, Honjō, Ibusuki, Ikoma, Koshigaya, Kunitachi, Matsumoto, Nichinan, Nishinomiya, Toyohashi, Tenri, Usuki, and Yamato, and the towns of Inagawa, Kitajima, Miyoshi, Shōdoshima, Tadotsu, and Tonoshō. Nobeoka followed suit on 26 April, Urayasu on 1 May, and Nagaokakyō on 1 June 2021.
Measures to allow partnership certificates have been proposed in numerous areas, including several administrative wards in Tokyo, such as Arakawa, Chiyoda, Chūō, Katsushika, Kita, Kōtō, Nerima, Shinjuku, Sumida, and Taitō, and the cities of Abashiri, Asaka, Fukuyama, Funabashi, Hachiōji, Hannō, Hanyū, Hasuda, Hidaka, Iruma, Kasukabe, Kazo, Kitami, Kodaira, Komatsushima, Marugame, Matsuyama, Mima, Mishima, Miyoshi, Morioka, Moroyama, Musashino, Nagayo, Niiza, Obihiro, Okazaki, Rikuzentakata, Sanuki, Sayama, Sendai, Shiki, Sōka, Toda, Tokigawa, Tokorozawa, Wakō, Warabi, Yashio, and Yoshikawa.
Prefectural partnership systems
In January 2019, the Government of Ibaraki Prefecture announced it was considering introducing a partnership system for same-sex couples in April 2019. In March 2019, Governor Kazuhiko Ōigawa expressed his personal support for the introduction of such a scheme. The Ibaraki Prefectural Assembly began examing legislation to this effect in June 2019. The prefecture has offered partnership certificates since July 1, 2019, which made it the first prefecture to do so. Eight days later, Mito, the prefectural capital, announced that couples who are in the possession of the prefecture's certificates would be eligible to move into the municipality's public housing facilities, starting in August 2019.
On 15 January 2020, Osaka Prefecture announced it would start a partnership system on January 22. Governor Hirofumi Yoshimura said in a statement that "we should aim for a society where one can live as themselves". The first couple to receive a certificate were Shuji Yamada and Shigeo Hiruda on 31 January. The certificate allows couples to apply to move into prefectural housing and consent to surgery, among other limited benefits. Five cities in Osaka had already established such a system before it was extended to the entire prefecture.
Gunma Prefecture announced on 5 November 2020 that it would introduce a partnership system by the end of the year. The system would provide same-sex couples with some limited recognition, including the right to move into prefectural housing and visit each other in hospitals. Governor Ichita Yamamoto said he hoped the move would "send a positive message" and "promote diversity". On 17 December, Yamamoto announced the system would be established on 21 December. The first certificate was issued to couple Saori Tanaka and Hisanagi Makita in Shibukawa on 24 December.
On 20 November 2020, Governor Eikei Suzuki of Mie Prefecture announced his intention to introduce a partnership system before the end of the year. The Mie Prefectural Assembly is expected to introduce the system in September 2021.
On 7 June 2021, the General Affairs Committee of the Tokyo Metropolitan Assembly unanimously accepted a petition, launched by LGBT activists and signed by 18,000 people, to establish a partnership system in Tokyo Metropolis. Governor Yuriko Koike expressed her support for the move, stating it would "respect the human rights of sexual minorities and promote the understanding of Tokyo citizens regarding diversity".
On October 30, 2019, the cities of Fukuoka and Kumamoto announced that they would recognize each other's partnership certificates effective immediately. This marked the first time that two or more jurisdictions in Japan had begun recognizing each other's certificates, easing recognition for same-sex couples. This means that if a same-sex couple with a certificate moves between both cities they need not reapply for a certificate in their new city. Since 1 April 2020, certificates from Kitakyushu and Koga are also recognized between the four cities. Certificates from Okayama and Nichinan are also recognised in Fukuoka.
On December 2, 2019, the mayor of Yokosuka announced his intention to establish a similar joint recognition with the fellow Kanagawa Prefecture cities of Zushi and Kamakura, taking effect on 1 April 2020. Hayama joined the scheme on 1 July 2020, and Miura joined on 1 January 2021.
In July 2020, Okayama and Sōja agreed to mutually recognize their certificates and eliminate the need for new procedures when couples move between the two cities. Okayama reached a similar agreement with Fukuoka in November 2020 and Hiroshima in January 2021, and is considering one with Takamatsu.
In early April 2021, the cities and towns of Amagasaki, Ashiya, Inagawa, Itami, Kawanishi, Nishinomiya, Sanda and Takarazuka, all in Hyōgo Prefecture, agreed to recognize each other's certificates. Likewise, in May 2021, 12 municipalites in Tokyo, Adachi, Bunkyō, Edogawa, Fuchū, Koganei, Kokubunji, Kunitachi, Minato, Nakano, Setagaya, Shibuya and Toshima, agreed to mutually recognize their certificates.
The following 103 municipalities and three prefectures have established a partnership oath system, comprising about 38% of the Japanese population. In 16 further jurisdictions, such policies have yet to take effect.
- Shibuya, Tokyo (2015)
- Setagaya, Tokyo (2015)
- Iga, Mie (2016)
- Takarazuka, Hyōgo (2016)
- Naha, Okinawa (2016)
- Sapporo, Hokkaido (2017)
- Fukuoka, Fukuoka (2018)
- Osaka, Osaka (2018)
- Nakano, Tokyo (2018)
- Ōizumi, Gunma (2019)
- Chiba, Chiba (2019)
- Edogawa, Tokyo (2019)
- Fuchū, Tokyo (2019)
- Hirakata, Osaka (2019)
- Kumamoto, Kumamoto (2019)
- Odawara, Kanagawa (2019)
- Sakai, Osaka (2019)
- Sōja, Okayama (2019)
- Toshima, Tokyo (2019)
- Yokosuka, Kanagawa (2019)
- Kanuma, Tochigi (2019)
- Miyazaki, Miyazaki (2019)
- Kitakyushu, Fukuoka (2019)
- Nishio, Aichi (2019)
- Nagasaki, Nagasaki (2019)
- Sanda, Hyōgo (2019)
- Katano, Osaka (2019)
- Yokohama, Kanagawa (2019)
- Daitō, Osaka (2019)
- Kamakura, Kanagawa (2019)
- Mitoyo, Kagawa (2020)
- Amagasaki, Hyōgo (2020)
- Bunkyō, Tokyo (2020)
- Hamamatsu, Shizuoka (2020)
- Kijō, Miyazaki (2020)
- Koga, Fukuoka (2020)
- Minato, Tokyo (2020)
- Nara, Nara (2020)
- Niigata, Niigata (2020)
- Sagamihara, Kanagawa (2020)
- Saitama, Saitama (2020)
- Takamatsu, Kagawa (2020)
- Tokushima, Tokushima (2020)
- Yamatokōriyama, Nara (2020)
- Zushi, Kanagawa (2020)
- Kawagoe, Saitama (2020)
- Toyoake, Aichi (2020)
- Itami, Hyōgo (2020)
- Ashiya, Hyōgo (2020)
- Hayama, Kanagawa (2020)
- Inabe, Mie (2020)
- Kawasaki, Kanagawa (2020)
- Okayama, Okayama (2020)
- Tondabayashi, Osaka (2020)
- Kawanishi, Hyōgo (2020)
- Kaizuka, Osaka (2020)
- Kyoto, Kyoto (2020)
- Sakado, Saitama (2020)
- Koganei, Tokyo (2020)
- Kitamoto, Saitama (2020)
- Matsudo, Chiba (2020)
- Tochigi, Tochigi (2020)
- Kokubunji, Tokyo (2020)
- Kōnosu, Saitama (2020)
- Hirosaki, Aomori (2020)
- Shibukawa, Gunma (2020)
- Higashikagawa, Kagawa (2021)
- Miura, Kanagawa (2021)
- Yoshinogawa, Tokushima (2021)
- Hiroshima, Hiroshima (2021)
- Akashi, Hyōgo (2021)
- Kōchi, Kōchi (2021)
- Okegawa, Saitama (2021)
- Kameoka, Kyoto (2021)
- Ina, Saitama (2021)
- Ageo, Saitama (2021)
- Adachi, Tokyo (2021)
- Annaka, Gunma (2021)
- Chigasaki, Kanagawa (2021)
- Fuji, Shizuoka (2021)
- Fujisawa, Kanagawa (2021)
- Gyōda, Saitama (2021)
- Honjō, Saitama (2021)
- Ibusuki, Kagoshima (2021)
- Ikoma, Nara (2021)
- Inagawa, Hyōgo (2021)
- Kitajima, Tokushima (2021)
- Koshigaya, Saitama (2021)
- Kunitachi, Tokyo (2021)
- Matsumoto, Nagano (2021)
- Miyoshi, Saitama (2021)
- Nichinan, Miyazaki (2021)
- Nishinomiya, Hyōgo (2021)
- Shōdoshima, Kagawa (2021)
- Tadotsu, Kagawa (2021)
- Tenri, Nara (2021)
- Tonoshō, Kagawa (2021)
- Toyohashi, Aichi (2021)
- Usuki, Ōita (2021)
- Yamato, Kanagawa (2021)
- Nobeoka, Miyazaki (2021)
- Urayasu, Chiba (2021)
- Nagaokakyō, Kyoto (2021)
- Minamiashigara, Kanagawa (1 July 2021)
- Ōi, Kanagawa (1 July 2021)
- Mie Prefecture (September 2021)
- Ube, Yamaguchi (September 2021)
- Fujimi, Saitama (2021)
- Hakusan, Ishikawa (2021)
- Higashimatsuyama, Saitama (2021)
- Himeji, Hyōgo (2021)
- Kagoshima, Kagoshima (2021)
- Kanazawa, Ishikawa (2021)
- Kuki, Saitama (2021)
- Nagoya, Aichi (2021)
- Hakodate, Hokkaido (2022)
- Karatsu, Saga (2022)
- Hida, Gifu (TBD, supposed to have been introduced in 2019)
- Narashino, Chiba (TBD, supposed to have been introduced in 2020)
The first couple to receive a partnership certificate were Koyuki Higashi and Hiroko Masuhara in Shibuya on 5 November 2015. They were personally congratulated by Mayor Ken Hasebe. Later that day, Setagaya Ward issued certificates to seven couples. By April 2017, 17 same-sex couples had been issued partnership certificates in Shibuya.
Nijiiro Diversity maintains statistics on the number of registered couples. It has found a large increase in partnerships: 319 in late November 2018, 426 in April 2019, 617 in October 2019, 759 in January 2020, 945 in April 2020, 1,052 in June 2020, and 1,301 in November 2020.
As a private sector response to the lack of national recognition of same-sex partnerships, the Famiee Project created a digital blockchain-secured partnership registry in 2019. In order to receive a Famiee certificate, the couple must apply via an mobile app and will receive a digital certificate to be used as proof of familial status. The Famiee Project received the backing of at least 17 companies who will recognize the digital partnership certificate and treat a couple the same as a different-sex marriage for banking and insurance purposes. The partnerships are not currently recognized by the Government of Japan, but aim to create pressure from the private sector for political action to expand LGBT rights in the country.
Same-sex marriage (同性結婚, dōsei kekkon)[a] is not recognized in Japan. However, debate surrounding the issue has emerged in recent years, with several political parties expressing support or openness to discuss the matter. Several lawsuits contesting the same-sex marriage ban contained in the Civil Code were filed in court in February 2019. In addition, numerous opinion surveys have shown high levels of support for same-sex marriage among the Japanese public, notably among women and the younger generation.
On March 27, 2009, it was reported that Japan allows its nationals to marry same-sex foreign partners in countries where same-sex marriage is legal. Japan does not allow same-sex marriage domestically and had so far also refused to issue a document, which states that a person is single and of legal age and is required for citizens to wed overseas, if the applicant's intended spouse was of the same legal sex. Under the change, the Ministry of Justice instructed local authorities to issue the key certificate for those who want to have same-sex marriages.
In June 2011, the deputy head abbot of Kyoto's Shunkō-in Zen temple announced that the temple would perform same-sex marriage ceremonies as part of Gay and Lesbian Pride Month. Similarly, in April 2020, Senda Akihiro, the deputy head abbot of Kawagoe's Saimyouji temple, announced that he will perform same-sex marriage ceremonies.
Since 15 May 2012, Tokyo Disney Resort has allowed symbolic (not legally recognized) same-sex marriage ceremonies in its Cinderella's Castle hotel. On March 3, 2013, its first same-sex marriage was held between Koyuki Higashi and her partner Hiroko Masuhara.
In March 2019, the Justice Ministry revoked a deportation order for a gay Taiwanese man who had remained in Japan illegally after overstaying his visa, giving consideration to his longtime same-sex relationship with a Japanese national. The ministry issued a special residency permit to the man, who had lived in Japan for about 25 years. The ministry's Immigration Bureau granted him a one-year resident visa after the Tokyo District Court suggested that it review the order.
Article 24 of the Japanese Constitution states: "Marriage shall be based only on the mutual consent of both sexes and it shall be maintained through mutual cooperation with the equal rights of husband and wife as a basis." Previously, a couple in Japan could marry only if their respective head of household (the father, or in the absence of a father, the eldest son) consented to the union. As a result, arranged marriage was the dominant form of marriage. Those couples who could not obtain permission had to elope and stay in common-law marriage.
The purpose of Article 24 of the Constitution was to assert freedom of consenting adults to marry, and to explicitly establish the equality of both sexes in marriage. The wording defines marriage as a union of husband and wife. Some legal scholars argue that because the intent behind the article was not in reference to same-sex marriage, it need not apply in legalising same-sex marriage. However, conservative lawmakers as well as legal scholars who take a literal approach to constitutional interpretation argue that such an argument is a stretch.
We need to eliminate lifestyle difficulties for same-sex couples. A prerequisite to achieving this goal is dealing with Article 24 of the Constitution.
Extending the institution of marriage to same-sex couples was not anticipated under the current Constitution. It is an issue that concerns the very core of family values and, I believe, one that requires extremely careful consideration.
In July 2019, the Japan Federation of Bar Associations submitted a paper in support of same-sex marriage to the Minister of Justice, the Prime Minister, the Speaker of the House of Representatives and the President of the House of Councillors. The paper states that Article 24 does not ban such marriages as "the notion of same-sex marriage was beyond the scope of assumption at the time of [its] enactment", and that prohibiting it constitutes a major breach of human rights, urging the National Diet to legalize same-sex marriage.
Political support and legislation
The opposition Constitutional Democratic Party of Japan (CDP) supports same-sex marriage. In December 2018, the party announced it would introduce a bill in 2019 to amend the Civil Code to legalise same-sex marriage. On 3 June 2019, the bill was submitted by the CDP, the Japanese Communist Party and the Social Democratic Party. It seeks to adopt gender-neutral language with the terms "party of marriage" being used instead of "husband" and "wife", while "father and mother" would be replaced by "parents". In June 2019, the CDP added the legalisation of same-sex marriage and ending discrimination against the LGBT community to their party platform ahead of the 2019 Japanese House of Councillors election.
Individual lawmakers from the Liberal Democratic Party (including the former Minister of Agriculture, Ken Saitō), the Democratic Party for the People (including party leader Yuichiro Tamaki), Nippon Ishin no Kai and Komeito have also expressed their personal support for same-sex marriage. Both councillors from Reiwa Shinsengumi, Eiko Kimura and Yasuhiko Funago, also support same-sex marriage.
Supporters of same-sex marriage hope the introduction of the partnership oath system in numerous municipalities will encourage parliamentarians to legalise same-sex marriage. The LGBT organisation Marriage for All Japan has also organised signature gatherings and meetings with lawmakers from across the political spectrum. The organisation notes in particular that the COVID-19 pandemic has made same-sex couples more "vulnerable" and "anxious", as they cannot visit each other in hospitals nor are they entitled to any legal recognition if one of the partners were to die.
In November 2018, several same-sex couples throughout the country announced their intention to file suit against the country's same-sex marriage ban. In January 2019, about a dozen same-sex couples applied for marriage certificates at different city offices in Japan. Lawsuits contesting the same-sex marriage ban were filed by 13 couples on 14 February (Valentine's Day) in district courts in Tokyo, Osaka, Nagoya and Sapporo. Another three couples filed in Fukuoka a few months later.
On 17 March 2021, the district court in Sapporo issued a judgment finding that the law banning same-sex marriage violated the constitutional rights of same-sex couples, specifically Article 14 of the Constitution of Japan (which bans discrimination on the basis of "race, creed, sex, social status or family origin"). However, the court rejected the request of the six plaintiffs (two male couples and one female couple) for one million Japanese yen (equivalent to about 9,000 U.S. dollars or 6,480 British pounds) per person for the denial. The court rejected the government's argument that Article 24 of the Constitution (which defines marriage as based on the "mutual consent of both sexes") limits marriage to opposite-sex couples; plaintiffs argued that this article actually only bars forced marriage. Chief Cabinet Secretary Katsunobu Katō said at a press conference later that day that the Ministry of Justice would analyse the court ruling.
Similar arguments have been raised in the Tokyo District Court case, in which hearings and oral arguments took place on several dates in 2019 and 2020. The plaintiffs, Chizuka Oe and Yoko Ogawa, a couple for 25 years, argue that banning same-sex marriage violates articles 13 and 14 of the Constitution. Lawyers representing the couples believe the ruling from the Sapporo District Court is likely to have a positive impact on the outcome of the other cases as they use nearly identical language to the one heard in Sapporo.
On 4 March 2020, the Tokyo High Court ruled that cohabiting same-sex couples should be entitled to the same legal benefits as those granted to cohabiting heterosexual couples. This ruling provided legitimacy to the plaintiff's same-sex relationship, allowing the plaintiff to sue her lesbian partner of seven years for infidelity in a move that was previously restricted to heterosexual partners. The decision was upheld by the Supreme Court of Japan on 18 March 2021.
In Japan, each citizen is registered through the koseki system whereby an individual is registered as a part of a household (while in the West, a birth certificate can act as a proof of identity). Koseki registration performs a somewhat similar role to marriage in the West as it endows a member of the same koseki legal power (as next of kin) in dealing with civil matters such as inheritance, hospital visits or the right to organise a funeral. Therefore, registering each other as a part of the koseki works as a substitute for Western-style marriage. As a consequence, Japanese gay couples, in the absence of same-sex marriage or civil partnership laws, often use adoption procedures to register themselves as belonging to the same household (where the older partner legally adopts the younger partner, which in absence of a spouse makes the only adopted child the sole executor of that household).
A May 2013 Ipsos poll found that out of over a thousand Japanese adult interviewees 24% were in favor of same-sex marriage and another 27% supported other forms of recognition for same-sex couples. An April 2014 Ipsos poll found that 26% of respondents were in favor of same-sex marriage and 24% were in favor of some other form of recognition, such as civil unions. A May 2015 Ipsos poll found that 30% of respondents were in favour of same-sex marriage and a further 28% were in favour of some other form of recognition (meaning that 58% supported recognising same-sex couples in some form).
According to a survey by Nihon Yoron Chōsa-ka, conducted on 1 and 2 March 2014, 42.3% of Japanese people supported same-sex marriage, while 52.4% opposed it. Another poll conducted by Fuji News Network in April 2015 showed that 59% supported the same-sex partnership certificate system proposed in Shibuya and 53% supported same-sex marriage. This was the first time a poll had found majority support for same-sex marriage in Japan. An additional poll conducted by the National Institute of Population and Social Security Research in November 2015 showed a 51% majority as supporting same-sex marriage, unions or partnerships. 41% were opposed. People under the age of 20 were overwhelmingly in favor of same-sex marriage (72% support), whereas people aged 70 and over overwhelmingly opposed (24% support).
According to an opinion poll carried out by Dentsu in October 2018, 78.4% of Japanese people in their 20s to 50s were in favour of same-sex marriage. Support was higher among women (87.9%) than men (69.2%), and was higher among younger respondents: 87.3% for people in their 20s, 81.2% for people in their 30s, 77.5% for people in their 40s, and 72.5% for people in their 50s.
The National Survey of Household Trends, a government survey carried out in 2018 and commissioned by the National Institute of Population and Social Security Research, asked Japanese married women about their views on legalizing same-sex marriage. 71.9% of respondents chose one of the two answers in favour of it. Levels of support were clearly different between the different age groups: 92.1% for married women under the age of 30, 89.5% for those between the ages of 30 and 39, 83.2% for those between the ages of 40 and 49, 73.5% for those between 50 and 59, 59.3% for those between 60 and 69, and 42.2% for those aged 70 and higher.
A 2019 opinion survey conducted by Hiroshima Shudo University and published in November 2020 showed that 64.8% of the Japanese public supported same-sex marriage, while 30.0% were opposed. Attitudes varied greatly with age, with 81% of 20–30-year-olds supporting, followed by 74% of people in their 40s and 50s, and 47% of people in their 60s and 70s.
A joint survey by the University of Tokyo and The Asahi Shimbun, conducted between March and April 2020, showed that 46% of Japanese people favored same-sex marriage, 31% were neutral and 23% were opposed. Among supporters of the Liberal Democratic Party (LDP), support was 41% and opposition at 29%. This contrasted significantly with the opinions of LDP lawmakers, as a 2019 survey conducted shortly before the House of Councillors election showed that only 9% of LDP candidates supported same-sex marriage. Professor Masaki Taniguchi, who headed the survey, stated that it was rare to witness public opinion on a certain issue change so rapidly, noting that support had increased 14% from 2017.
A March 2021 poll from The Asahi Shimbun found that 65% of Japanese people supported same-sex marriage, with support rising to 86% among 18–29-year-olds.
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