Composition
of the House

Officers of the House
Strength of the In-House Groups in the House of Representatives
List of Members

(As of October 29, 2025)

A	B	C	D
E	F	G	H
I	J	K	L
M	N	O	P
Q	R	S	T
U	V	W	X
Y	Z

O

Name	In-House Group	Constituency/Area
OBUCHI Yuko	LDP	Gunma 5th District
OCHIAI Takayuki	CDP	Tokyo 6th District
ODAKE Kai	DPFP	Hokuriku-Shinetsu Bloc
OGATA Rintaro	YK	Fukuoka 9th District
OGAWA Junya	CDP	Kagawa 1st District
OGUMA Shinji	CDP	Fukushima 3rd District
OGUSHI Hiroshi	CDP	Saga 2nd District
OGUSHI Masaki	LDP	Kinki Bloc
OHKAWARA Masako	CDP	Tokyo 21st District
OHNO Keitaro	LDP	Kagawa 3rd District
OHSAKA Seiji	CDP	Hokkaido 8th District
OISHI Akiko	*	Kinki Bloc
OKADA Hanako	CDP	Aomori 3rd District
OKADA Katsuya	CDP	Mie 3rd District
OKADA Satoru	CDP	Kinki Bloc
OKAJIMA Kazumasa	CDP	Minami Kanto Bloc
OKAMOTO Akiko	CDP	Miyagi 1st District
OKAMOTO Mitsunari	KM	Tokyo 29th District
OKAMOTO Mitsunori	CDP	Aichi 9th District
OKANO Junko	DPFP	Minami Kanto Bloc
OKUNO Soichiro	CDP	Chiba 9th District
OKUSHITA Takemitsu	JIP	Osaka 7th District
OMORI Eriko	KM	Tokyo Bloc
ONIKI Makoto	LDP	Kyushu Bloc
ONISHI Kensuke	CDP	Aichi 13th District
ONISHI Youhei	LDP	Tokyo 16th District
ONODERA Itsunori	LDP	Miyagi 5th District
OOKA Toshitaka	LDP	Kinki Bloc
OSHIMA Atsushi	CDP	Saitama 6th District
OTAKE Rie	CDP	Tokai Bloc
OTSUJI Kanako	CDP	Kinki Bloc
OTSUKA Sayuri	CDP	Kanagawa 20th District
OTSUKI Kureha	CDP	Hokkaido 4th District
OZAKI Masanao	LDP	Kochi 2nd district
OZAWA Ichiro	CDP	Iwate 3rd District
OZORA Koki	LDP	Tokyo Bloc

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

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.