Vote Value Disparity

Constitutional dispute over inequality in the weight of a single vote between sparsely and densely populated constituencies.

1. 2025 House of Representatives Election Invalidation Case (Population Disparity)

2. Jurisdiction: Japan (2025)
3. Original Case: 令和7(行ケ)2 人口比例選挙請求事件
4. DefendantsThe State of JapanPlaintiffsHiroshi KamiwakiJudgesYukihiko Imasaki (Chief Justice)InstitutionsSupreme Court of Japan, Grand Bench
5. Case Tags: Constitutional Litigation;Vote Value Disparity;Supreme Court Grand Bench;Reiwa Era Case

1. Reiwa 7 (Gyo-Ke) 2 Election Invalidity Lawsuit

2. Jurisdiction: Japan (October 27, 2024 (election date); 2025 (lawsuit filing and ruling))
3. Original Case: 令和7(行ケ)2 選挙無効請求事件
4. PlaintiffsHidetoshi MasunagaGroup of AttorneysPlaintiff AttorneysHidetoshi MasunagaJudgesYukihiko ImasakiInstitutionsSupreme Court of JapanTokyo High Court
5. Case Tags: Election Invalidity;Vote Value Disparity;Japan Supreme Court;Constitutionality Review

1. 2025 House of Representatives Election Invalidation Case

2. Jurisdiction: Japan (October 2025)
3. Original Case: 令和7(行ケ)1 選挙無効請求事件
4. DefendantsTokyo Metropolitan Election Administration CommissionOsaka Prefecture Election Administration CommissionState of JapanPlaintiffsTaro YamadaHanako SuzukiIchiro SatoPlaintiff AttorneysHidetoshi MasunagaJudgesYukihiko ImasakiMichiharu HayashiToru SakaiInstitutionsSupreme Court of JapanTokyo High CourtTokyo Metropolitan Election Administration Commission
5. Case Tags: Election Invalidation;Vote Value Disparity;Unconstitutionality;Japanese Supreme Court