Composition
of the House

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

(As of February 18, 2026)

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
OBANA Akihito	LDP	Saitama 6th District
OBUCHI Yuko	LDP	Gunma 5th District
OCHIAI Takayuki	CRA	Tokyo Bloc
ODAKE Kai	DPFP	Hokuriku-Shinetsu Bloc
ODAWARA Kiyoshi	LDP	Tokyo 21st District
OGATA Rintaro	Ind	Fukuoka 9th District
OGAWA Junya	CRA	Kagawa 1st District
OGUSHI Masaki	LDP	Hyogo 6th District
OHNO Keitaro	LDP	Kagawa 3rd District
OKAMOTO Mitsunari	CRA	Tokyo Bloc
OKAMOTO Yasuhiro	LDP	Aichi 5th District
OKANO Junko	DPFP	Minami Kanto Bloc
OKUSHITA Takemitsu	JIP	Osaka 7th District
OMI Asako	LDP	Kita Kanto Bloc
OMORI Eriko	CRA	Tokyo Bloc
ONIKI Makoto	LDP	Fukuoka 2nd District
ONISHI Yohei	LDP	Tokyo 16th District
ONODERA Itsunori	LDP	Miyagi 5th District
OOKA Toshitaka	LDP	Shiga 1st District
OSADA Koichiro	LDP	Tokai Bloc
OSHIMA Atsushi	CRA	Kita Kanto Bloc
OTSUKA Taku	LDP	Saitama 9th District
OZAKI Masanao	LDP	Kochi 2nd district
OZATO Yasuhiro	LDP	Kyushu Bloc
OZORA Koki	LDP	Tokyo 15th District

Notes:
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.