National

Member of the House of Councillors

Japanese: 参議院議員

House of Councillors · Japan

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How it's filled

In plain words: Elected every 3 years
Exact method: 6-year term with half of the seats elected every 3 years (Constitution Art. 46); the House cannot be dissolved. 148 members are elected in 45 prefectural or combined-prefecture districts (single non-transferable vote) and 100 by open-list proportional representation nationwide (Public Offices Election Act).
Seats: 248

Source: japaneselawtranslation.go.jp, checked Oct 12, 2026

Who holds these seats now

Members are elected in constituencies or from party lists, as each row says.

Seat	Held by
Aichi	Junko Sugimoto Sanseito ReportKōichi Mizuno DPFP ReportMaiko Tajima CDP ReportMasahito Fujikawa LDP ReportRyūji Satomi Komeito ReportTakae Itō DPFP ReportYasuyuki Sakai LDP ReportYoshitaka Saitō CDP Report
Akita	Hiroo Ishii LDP ReportShizuka Terata LDP Report
Aomori	Masayo Tanabu CDP ReportMasumi Fukushi CDP Report
Chiba	Hiroyuki Konishi CDP ReportHiroyuki Nagahama CDP ReportJunichi Ishii LDP ReportKuniko Inoguchi LDP ReportSayaka Kobayashi DPFP ReportShoichi Usui LDP Report
Ehime	Junzo Yamamoto LDP ReportTakako Nagae Report
Fukui	Hirofumi Takinami LDP ReportMasaaki Yamazaki LDP Report
Fukuoka	Kōzō Akino Komeito ReportMasaji Matsuyama LDP ReportRokuta Shimono Komeito ReportSatoshi Ōie LDP ReportYukihito Koga CDP ReportYuko Nakada Sanseito Report
Fukushima	Hokuto Hoshi LDP ReportMasako Mori LDP Report
Gifu	Atsuko Wakai LDP ReportTakeyuki Watanabe LDP Report
Gunma	Hirofumi Nakasone LDP ReportMasato Shimizu LDP Report
Hiroshima	Eri Mikami CDP ReportHidenori Nishita LDP ReportShinji Morimoto CDP ReportYoichi Miyazawa LDP Report
Hokkaido	Eri Tokunaga CDP ReportGaku Hasegawa LDP ReportHarumi Takahashi LDP ReportKenji Katsube CDP ReportToshimitsu Funahashi LDP ReportTsuyohito Iwamoto LDP Report
Hyogo	Daisuke Katayama Ishin ReportFusaho Izumi ReportHiroyuki Kada LDP ReportMitsuo Takahashi Komeito ReportShinsuke Suematsu LDP ReportTakae Itō Komeito Report
Ibaraki	Akiyoshi Katō LDP ReportMakiko Dōgomi DPFP ReportRyōsuke Kōzuki LDP ReportShoko Sakurai Sanseito Report
Ishikawa	Naoki Okada LDP ReportShūji Miyamoto LDP Report
Iwate	Eiji Kidoguchi CDP ReportTakanori Yokosawa CDP Report
Japan (national list)Elected from the national list	Ai Aoki CDP ReportAkemi Matsuno Ishin ReportAkiko Honda LDP ReportAkira Koike JCP ReportChikage Koga CDP ReportDaijirō Harada Komeito ReportDaisaku Hiraki Komeito ReportDaisuke Kajihara LDP ReportDaisuke Tenbata ReportEiko Kimura ReportEriko Imai LDP ReportEriko Yamatani LDP ReportFumiyo Okuda ReportHanako Jimi LDP ReportHaruko Arimura LDP ReportHaruo Kitamura CPJ ReportHideharu Hasegawa LDP ReportHideki Higashino LDP ReportHiroshi Andō Sanseito ReportHiroshi Yamada LDP ReportHitoshi Takezume DPFP ReportHotaru Ueno Ishin ReportIsamu Ueda Komeito ReportKanehiko Shindō LDP ReportKatsumi Ogawa LDP ReportKazuhiro Fujii LDP ReportKen Akamatsu LDP ReportKen'ichirō Saitō ReportKenji Isezaki ReportKenta Aoshima Ishin ReportKiyomi Tsujimoto CDP ReportKiyoshi Nakajō Ishin ReportKota Hirado DPFP ReportKusuo Oshima ReportKyoko Murata CDP ReportLaSalle Ishii SDP ReportMakoto Hamaguchi DPFP ReportMakoto Oniki CDP ReportMami Tamura DPFP ReportMamoru Fukuyama LDP ReportManabu Matsuda Sanseito ReportMana Iwamoto Sanseito ReportMasaaki Taniai Komeito ReportMasafumi Sasaki Komeito ReportMasahiro Ishida LDP ReportMasahito Ozawa CDP ReportMasako Kishi CDP ReportMasaru Miyazaki Komeito ReportMasashi Adachi LDP ReportMasayuki Kamiya LDP ReportMegumi Ishii Ishin ReportMichihiro Ishibashi CDP ReportMichihito Kaneko Ishin ReportMikishi Daimon JCP ReportMitsuko Ishii Ishin ReportMizuho Fukushima SDP ReportMizuho Umemura Sanseito ReportMuneo Suzuki LDP ReportNaoki Hyakuta CPJ ReportNaoki Inose Ishin ReportRenhō CDP ReportRio Tomono LDP ReportRyō Kōriyama CDP ReportSaori Yoshikawa CDP ReportSatoshi Kamayachi LDP ReportSatsuki Katayama LDP ReportSeiichi Kushida Ishin ReportSeiko Hashimoto LDP ReportSen Yamanaka Sanseito ReportShigenori Kenzaka LDP ReportShin'ichi Shiba CDP ReportShin'ichi Yokoyama Komeito ReportShinji Takeuchi Komeito ReportShin'ya Fujiki LDP ReportShi Ping Ishin ReportShōji Maitachi LDP ReportShōta Gotō Sanseito ReportShun'ichi Mizuoka CDP ReportShūsaku Indō LDP ReportSōhei Kamiya Sanseito ReportSohei Nihi JCP ReportTakahiro Anno Mirai ReportTakanori Kawai DPFP ReportTakashi Tsukasa Komeito ReportTakumi Shibata Ishin ReportTarō Yamada LDP ReportTatsuo Itō DPFP ReportTetsuji Isozaki DPFP ReportTetsuya Kubota Komeito ReportTomo Iwabuchi JCP ReportToshiyuki Ochi LDP ReportYasushi Adachi DPFP ReportYōko Shirakawa JCP ReportYoshifumi Hamano DPFP ReportYoshihiko Yamada DPFP ReportYoshio Kimura LDP ReportYoshiyuki Inoue LDP ReportYūji Adachi Sanseito ReportYukiko Kada Ishin ReportYuko Mori CDP Report
Kagawa	Hidekazu Harada DPFP ReportYoshihiko Isozaki LDP Report
Kagoshima	Tetsuro Nomura LDP ReportTomomi Otsuji Mirai Report
Kanagawa	Akihiro Kagoshima DPFP ReportHiroe Makiyama CDP ReportHiroki Hajikano Sanseito ReportJunko Mihara LDP ReportKeiichirō Asao LDP ReportMasaaki Waki LDP ReportNobuhiro Miura Komeito ReportShigefumi Matsuzawa Ishin Report
Kumamoto	Seishi Baba LDP ReportYoshifumi Matsumura LDP Report
Kyoto	Akira Yoshii LDP ReportShōhei Niimi Ishin ReportShoji Nishida LDP ReportTetsuro Fukuyama Report
Mie	Sachiko Yamamoto LDP ReportTomoko Kojima CDP Report
Miyagi	Mitsuru Sakurai LDP ReportNoriko Ishigaki CDP Report
Miyazaki	Kanako Yamauchi CDP ReportShinpei Matsushita LDP Report
Nagano	Hideya Sugio CDP ReportJirō Hata CDP Report
Nagasaki	Keisuke Yamamoto LDP ReportYūichirō Koga LDP Report
Nara	Iwao Horii LDP ReportKei Satō LDP Report
Niigata	Kazuhiro Kobayashi LDP ReportSakura Uchikoshi CDP Report
Oita	Harutomo Koshō LDP ReportTadatomo Yoshida CDP Report
Okayama	Kimi Onoda LDP ReportKōichirō Kobayashi LDP Report
Okinawa	Sachika Takara ReportYōichi Iha Report
Osaka	Chisato Miyade Sanseito ReportFutoshi Okazaki Ishin ReportHirotaka Ishikawa Komeito ReportHisatake Sugi Komeito ReportHitoshi Asada Ishin ReportKaori Takagi Ishin ReportRui Matsukawa LDP Report佐々木りえ Ishin Report
Saga	Takamaro Fukuoka LDP ReportYūhei Yamashita LDP Report
Saitama	Hiroto Kumagai CDP ReportKiyoshi Ueda DPFP ReportKumiko Ehara DPFP ReportMakoto Nishida Komeito ReportMari Takagi CDP ReportMasakazu Sekiguchi ReportToshiharu Furukawa LDP ReportTsutomu Ōtsu Sanseito Report
Shiga	Kazuhiro Miyamoto LDP ReportTakashi Koyari LDP Report
Shizuoka	Kazuya SHIMBA DPFP ReportSachiko Hirayama ReportTakao Makino LDP ReportYōhei Wakabayashi LDP Report
Tochigi	Katsunori Takahashi LDP ReportMichiko Ueno LDP Report
Tokushima-Kochi	Hajime Hirota CDP ReportYūsuke Nakanishi LDP Report
Tokyo	Akiko Ikuina LDP ReportAyaka Shiomura CDP ReportDaichi Suzuki LDP ReportKentaro Asahi LDP ReportMayu Ushida DPFP ReportSayaka Shioiri Sanseito ReportTaku Yamazoe JCP ReportToshiko Takeya Komeito ReportYoshihiro Okumura DPFP ReportYoshiko Kira JCP ReportYudai Kawamura Komeito Report
Tottori-Shimane	Kazuhiko Aoki LDP ReportMomoko Degawa LDP Report
Toyama	Kōtarō Nogami LDP ReportYukie Niwata DPFP Report
Wakayama	Yoshio Mochizuki ReportYōsuke Tsuruho LDP Report
Yamagata	Michiya Haga DPFP ReportYasue Funayama DPFP Report
Yamaguchi	Kiyoshi Ejima LDP ReportTsuneo Kitamura LDP Report
Yamanashi	Hitoshi Goto DPFP ReportManabu Nagai LDP Report

Next vote

Must be held by July 2028 (no fixed date) General election

Sources

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
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: Member of the House of Councillors in Japanese
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: Ai Aoki, current term, Akemi Matsuno, current term, Akihiro Kagoshima, current term, Akiko Honda, current term, Akiko Ikuina, current term and 241 more
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 25, 2028

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