Photo Name In-House Group Constituency/Area
Ms. OBUCHI YukoMs. OBUCHI YukoLDPGumma 5th District
Mr. OCHI TakaoMr. OCHI TakaoLDPTokyo Bloc
Mr. OCHIAI TakayukiMr. OCHIAI TakayukiCDPTokyo 6th District
Mr. ODAWARA KiyoshiMr. ODAWARA KiyoshiLDPTokyo Bloc
Mr. OGAWA JunyaMr. OGAWA JunyaCDPShikoku Bloc
Mr. OGUCHI YoshinoriMr. OGUCHI YoshinoriKMTokai Bloc
Mr. OGUMA ShinjiMr. OGUMA ShinjiDPFPTohoku Bloc
Mr. OGURA MasanobuMr. OGURA MasanobuLDPTokyo 23rd District
Mr. OGUSHI HiroshiMr. OGUSHI HiroshiCDPSaga 2nd District
Mr. OGUSHI MasakiMr. OGUSHI MasakiLDPHyogo 6th District
Mr. OKADA KatsuyaMr. OKADA KatsuyaCDPMie 3rd District
Mr. OKAJIMA KazumasaMr. OKAJIMA KazumasaCDPMinami Kanto Bloc
Ms. OKAMOTO AkikoMs. OKAMOTO AkikoCDPTohoku Bloc
Mr. OKAMOTO MitsunariMr. OKAMOTO MitsunariKMKita Kanto Bloc
Mr. OKAMOTO MitsunoriMr. OKAMOTO MitsunoriDPFPTokai Bloc
Mr. OKASHITA ShoheiMr. OKASHITA ShoheiLDPKinki Bloc
Ms. OKAWARA MasakoMs. OKAWARA MasakoCDPKita Kanto Bloc
Mr. OKONOGI HachiroMr. OKONOGI HachiroLDPKanagawa 3rd District
Mr. OKUMA KazuhideMr. OKUMA KazuhideLDPKinki Bloc
Mr. OKUNO ShinsukeMr. OKUNO ShinsukeLDPKinki Bloc
Mr. OKUNO SoichiroMr. OKUNO SoichiroDPFPMinami Kanto Bloc
Ms. OMI AsakoMs. OMI AsakoLDPGumma 1st District
Mr. ONIKI MakotoMr. ONIKI MakotoLDPFukuoka 2nd District
Mr. ONISHI HideoMr. ONISHI HideoLDPTokyo 16th District
Mr. ONISHI HiroyukiMr. ONISHI HiroyukiLDPOsaka 1st District
Mr. ONISHI KensukeMr. ONISHI KensukeDPFPAichi 13th District
Mr. ONO KeitaroMr. ONO KeitaroLDPKagawa 3rd District
Mr. ONODERA ItsunoriMr. ONODERA ItsunoriLDPMiyagi 6th District
Mr. OOKA ToshitakaMr. OOKA ToshitakaLDPShiga 1st District
Mr. OSAKA SeijiMr. OSAKA SeijiCDPHokkaido 8th District
Mr. OSHIMA AtsushiMr. OSHIMA AtsushiDPFPSaitama 6th District
Mr. OSHIMA TadamoriMr. OSHIMA TadamoriIndAomori 2nd District
Mr. OTA AkihiroMr. OTA AkihiroKMTokyo 12th District
Mr. OTA MasatakaMr. OTA MasatakaKMHokuriku-Shinetsu Bloc
Ms. OTSUJI KanakoMs. OTSUJI KanakoCDPKinki Bloc
Mr. OTSUKA TakashiMr. OTSUKA TakashiLDPOsaka 8th District
Mr. OTSUKA TakuMr. OTSUKA TakuLDPSaitama 9th District
Mr. OZATO YasuhiroMr. OZATO YasuhiroLDPKagoshima 3rd District
Mr. OZAWA IchiroMr. OZAWA IchiroDPFPIwate 3rd District

* No abbreviation
List of the In-House Groups in the House

In principle, House Members' names are spelled with the Hepburn system.
District: Single-seat constituency
Bloc: Proportional representation area

In-House Group: A group of House Members who engage in joint activities within the House. Usually, a political party forms an in-House group inside the House, but occasionally there are cases where a group is formed by (1) House Members who do not belong to a particular political party, (2) a political party and a House Member or Members who do not belong to any political party, or (3) two or more political parties.

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