House of Councillors

Sources

• japaneselawtranslation.go.jp · checked Oct 12, 2026 Ministry of Justice, Japanese Law Translation, The Constitution of Japan (Chapters I, IV, V, VI), read 2026-10-12: existence, composition and role of the Monarchy, Diet, House of Representatives, House of Councillors, Cabinet and Supreme Court. English names follow the bodies' own English sites (shugiin.go.jp, sangiin.go.jp, japan.kantei.go.jp, courts.go.jp). For: House of Councillors
• shugiin.go.jp · checked Oct 12, 2026 Official Japanese names from the National Diet, Cabinet, Courts and party sites (shugiin.go.jp, sangiin.go.jp, kantei.go.jp, courts.go.jp), read 2026-10-12: Japanese official names of authorities, offices and parties. For: House of Councillors in Japanese
• japaneselawtranslation.go.jp · checked Oct 12, 2026 Ministry of Justice, Japanese Law Translation, The Constitution of Japan, read 2026-10-12 (Art. 2, 6, 7, 45, 46, 58, 66-68, 79); seat counts 465 and 248 and the electoral systems from the Public Offices Election Act as summarised on the Diet sites (shugiin.go.jp/internet/index.nsf/html/index_e.htm, sangiin.go.jp/eng/). Cabinet offices: Prime Minister's Office, List of Ministers, 105th cabinet reshuffled 2026-09-17 (japan.kantei.go.jp/105/meibo/daijin/index.html). For: Member of the House of Councillors, President of the House of Councillors, Vice-President of the House of Councillors
• sangiin.go.jp · checked Oct 12, 2026 House of Councillors, 会派別所属議員数, as of 2026-10-12, read 2026-10-12: full official name of the in-house group in term.note (was the roster abbreviation); group totals match the stored members (464 + 1 vacancy; 247 + 1 vacancy). For: Junko Sugimoto as Member of the House of Councillors, Aichi, Koichi Mizuno as Member of the House of Councillors, Aichi, Maiko Tajima as Member of the House of Councillors, Aichi, Masahito Fujikawa as Member of the House of Councillors, Aichi, Ryuji Satomi as Member of the House of Councillors, Aichi and 242 more
• sangiin.go.jp · checked Oct 12, 2026 Current terms from the House of Representatives roster (shugiin.go.jp 議員一覧, as of 2026-09-28), House of Councillors roster (sangiin.go.jp, as of 2026-10-12) with group and term-expiry date, Cabinet (japan.kantei.go.jp/105/meibo/daijin/index.html, inaugurated 2026-09-17; former list /105/meibo_a/ inaugurated 2026-02-18), Speakers (shugiin.go.jp English 'Officers of the House', as of 2026-10-05), House of Councillors officers (sangiin.go.jp yakuin, 2026-10-12), Supreme Court justices (courts.go.jp 最高裁判所の裁判官), Emperor (kunaicho.go.jp). Member start dates are left empty because the rosters do not give them; party is the member's in-house group mapped to its party (groups mixing party and non-party members are mapped to the party). Read 2026-10-12. For: Junko Sugimoto as Member of the House of Councillors, Aichi, Koichi Mizuno as Member of the House of Councillors, Aichi, Maiko Tajima as Member of the House of Councillors, Aichi, Masahito Fujikawa as Member of the House of Councillors, Aichi, Ryuji Satomi as Member of the House of Councillors, Aichi and 244 more
• laws.e-gov.go.jp · checked Oct 12, 2026 e-Gov 法令検索, 公職選挙法 (Public Offices Election Act) Art. 32, read 2026-10-12: ordinary election held within 30 days before the terms end (32(1)), session exception (32(2)). Corrected latest date from 2028-07-25 (the expiry day itself) to 2028-07-24; 124 seats (50 PR, 74 district) per sangiin.go.jp 会派別所属議員数 as of 2026-10-12. For: General election, July 24, 2028
• sangiin.go.jp · checked Oct 12, 2026 House of Councillors roster (term expiry 令和10年7月25日 for 123 members plus a vacancy), Constitution Art. 46, Public Offices Election Act Art. 32, read 2026-10-12: next regular election, latest legal date, 124 seats up. For: General election, July 24, 2028, General election, July 25, 2028