Supreme Court Ruling on Same-Sex Marriage in Japan: Landmark Cases and Constitutional Implications

Japan’s legal stance on same-sex marriage remains unresolved as conflicting rulings from lower courts continue to shape the national debate, with the country’s highest court poised to deliver a final decision that could redefine marital rights nationwide.

In March 2025, both the Nagoya High Court and Osaka High Court ruled that Japan’s ban on same-sex marriage violates constitutional provisions, specifically Article 24(2) and Article 14(1) of the Constitution, which guarantee equality and individual dignity in family matters. These decisions marked a significant shift in judicial interpretation, suggesting that the current legal framework discriminates against same-sex couples by denying them marital recognition.

However, a subsequent ruling by the Tokyo High Court on November 28, 2025, upheld the constitutionality of the same-sex marriage ban, creating a direct contradiction in the appellate court decisions. This split among Japan’s high courts has intensified anticipation for a definitive ruling from the Supreme Court, which now holds the responsibility of resolving the conflicting interpretations.

The conflicting rulings stem from six separate lawsuits filed by same-sex couples across Japan, who argue that the government’s refusal to recognize their marriages violates their constitutional rights. With all high court decisions now issued, the cases are awaiting review by the Supreme Court, which will determine whether the national ban on same-sex marriage stands or is struck down as unconstitutional.

Despite the absence of national legislation recognizing same-sex marriage, some local governments have taken independent steps to acknowledge such relationships. As noted in background information, several municipalities and prefectures issue same-sex partnership certificates, offering limited recognition for purposes such as hospital visitation and housing access, though these do not confer the full legal rights of marriage under national law.

The issue has gained public attention through personal stories, including that of former Japanese pop star Ayaka Wada, who married her partner in Taiwan where same-sex marriage is legal. Her decision to wed abroad highlighted the limitations faced by LGBTQ individuals in Japan, where domestic legal recognition remains unavailable despite growing public support and judicial momentum in favor of reform.

As of April 2026, Japan does not recognize same-sex marriages or civil unions at the national level, maintaining a legal status that places it among the few developed democracies without such recognition. The upcoming Supreme Court decision will be closely watched not only for its immediate legal impact but also for its potential influence on broader LGBTQ rights and family law reforms in the country.