Chūgoku proportional representation block

The Chūgoku proportional representation block (比例中国ブロック) is one of eleven proportional representation (PR) "blocks", multi-member constituencies for the House of Representatives in the Diet of Japan. It consists of the prefectures of Tottori, Shimane, Okayama, Hiroshima, and Yamaguchi. Following the introduction of proportional voting, Chūgoku elected 13 representatives by PR in the 1996 general election, reduced to 11 in the election of 2000, and again to 10 in 2024.

Chūgoku Proportional Representation Block
Parliamentary constituency for the Japanese House of Representatives
Map of House of Representatives proportional blocks, with the Chūgoku block highlighted
Prefecture	Tottori, Shimane, Okayama, Hiroshima and Yamaguchi
Electorate	5,902,785 (2024)
Current constituency
Created	1994
Representatives	10

Results timeline

Vote share

Party		1996	2000	2003	2005	2009	2012	2014	2017	2021	2024
	LDP	42.81	35.59	37.41	36.72	32.37	34.53	38.16	39.18	43.36	35.89
	NFP	23.96
	DPJ[a]	12.59	21.68	33.80	28.59	39.73	16.28	17.08
	JCP	9.66	8.91	6.31	5.90	5.71	4.98	9.19	6.25	5.55	5.07
	SDP	6.37	9.23	4.77	5.15	3.64	1.96	2.11	1.39	1.69	1.82
	NPS	1.19
	Komeito		15.32	17.71	15.74	12.95	14.08	16.66	14.94	13.98	12.04
	LP		8.87
	PNP				7.90	4.85
	Ishin[b]						17.75	12.71	4.74	9.18	6.37
	Your						5.98
	TPJ						4.03
	CDP								16.72	18.38	19.45
	KnT								16.13
	DPFP									3.65	10.45
	Reiwa									3.03	5.90
	Sanseitō										3.00
Others		3.41[c]	0.40[d]			0.75[e]	0.41[f]	4.09[g]	0.65[h]	1.18[i]
Turnout			64.97	61.74	68.90	70.94	58.35	51.96	52.58	52.69	51.19

Seat distribution

Election	Distribution	Seats
1996		13
2000		11
2003		11
2005		11
2009		11
2012		11
2014		11
2017		11
2021		11
2024		10

List of representatives

D'Hondt allocation order	1996	2000	2003	2005	2009	2012	2014	2017
1	Kazuko Nose [ja]	Kiichi Miyazawa	Hisaoki Kamei	Toshiko Abe	Shunji Yuhara	Toshifumi Kojima	Toshiko Abe	Toshifumi Kojima
2	Tetsuo Saito	Isao Yamauchi [ja]	Isao Yamauchi [ja]	Takashi Wada [ja]	Toshiko Abe	Kei Nakamaru	Toshifumi Kojima	Mio Sugita
3	Yoshio Sakurauchi	Yoshiro Hayashi	Katsuyuki Kawai	Katsunobu Kato	Takashi Takai	Toshiko Abe	Michiyoshi Yunoki	Akiko Kamei
4	Yoshiro Hayashi	Tetsuo Saito	Tetsuo Saito	Tetsuo Saito	Yoshitaka Murata	Michiyoshi Yunoki	Tetsuo Saito	Michiyoshi Yunoki
5	Daikichi Ishibashi	Kozo Hirabayashi [ja]	Keisuke Tsumura	Mitsuo Mitani	Hiroshi Sugakawa	Tetsuo Saito	Masayoshi Shintani	Tetsuo Saito
6	Keigo Masuya	Toshimasa Yamada [ja]	Katsunobu Kato	Yoshitake Masuhara	Tetsuo Saito	Masayoshi Yoshino	Takashi Takai	Michitaka Ikeda
7	Kazuho Tanigawa [ja]	Tetsuo Kaneko [ja]	Koji Sato	Daisuke Matsumoto	Katsuyuki Kawai	Daisuke Sakamoto	Michitaka Ikeda	Keiichi Furuta
8	Seiji Masamori [ja]	Yoshiko Nakabayashi [ja]	Kazuko Nose [ja]	Seiji Hagiwara	Hiroki Hanasaki	Mitsuhiro Uesugi	Yoshinobu Ohira	Takashi Takai
9	Kozo Hirabayashi	Kazuho Tanigawa [ja]	Keigo Masuya	Hisaoki Kamei	Hidenao Nakagawa	Keisuke Tsumura	Keisuke Tsumura	Keisuke Tsumura
10	Mutsuki Kato	Koji Sato	Takashi Wada [ja]	Keigo Masuya	Noboru Miura	Keigo Masuya	Keigo Masuya	Shogo Nemoto
11	Hinokita Hitoshi [ja]	Keigo Masuya	Shinji Sato	Gaku Hashimoto	Toshiaki Komuro	Michitaka Ikeda	Keiichi Furuta	Keigo Masuya
12	Tadatoshi Akiba	Seats abolished
13	Shingo Nakagiri [ja]

Election results

2024

2024 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,056,320	35.89	7.47	5	1
	Constitutional Democratic Party of Japan (CDP)	572,598	19.45	1.08	3	1
	Komeito	354,291	12.04	1.95	1	1
	Democratic Party For the People (DPFP)	307,681	10.45	6.80	1	1
	Japan Innovation Party (Ishin)	187,517	6.37	2.81	0	1
	Reiwa Shinsengumi (Reiwa)	173,622	5.90	2.87	0	0
	Japanese Communist Party (JCP)	149,218	5.07	0.48	0	0
	Sanseitō	88,358	3.00	New	0	New
	Social Democratic Party (SDP)	53,620	1.82	0.13	0	0
Total		2,943,225	100.00		10	1
Invalid votes		78,661	2.60
Turnout		3,021,886	51.19	1.49
Registered voters		5,902,785

2021

2021 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,352,723	43.36	4.18	6	1
	Constitutional Democratic Party of Japan (CDP)	573,324	18.38	1.66	2	0
	Komeito	436,220	13.98	0.98	2	0
	Japan Innovation Party (Ishin)	286,302	9.18	4.43	1	1
	Japanese Communist Party (JCP)	173,117	5.55	0.70	0	0
	Democratic Party For the People (DPFP)	113,899	3.65	New	0	New
	Reiwa Shinsengumi (Reiwa)	94,446	3.03	New	0	New
	Social Democratic Party (SDP)	52,638	1.69	0.30	0	0
	NHK Party	36,758	1.18	New	0	New
Total		3,119,427	100.00		11
Invalid votes		72,840	2.28
Turnout		3,192,267	52.69	0.11
Registered voters		6,058,900

2017

2017 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,249,073	39.18	1.02	5	0
	Constitutional Democratic Party of Japan (CDP)	533,050	16.72	New	2	New
	Kibō no Tō	514,191	16.13	New	2	New
	Komeito	476,270	14.94	1.72	2	0
	Japanese Communist Party (JCP)	199,152	6.25	2.95	0	1
	Japan Innovation Party (Ishin)	151,221	4.74	New	0	New
	Social Democratic Party (SDP)	44,240	1.39	0.72	0	0
	Happiness Realization Party (HRP)	20,701	0.65	0.07	0	0
Total		3,187,898	100.00		11
Invalid votes		66,055	2.03
Turnout		3,253,953	52.58	0.61
Registered voters		6,189,041

2014

2014 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,183,903	38.16	3.63	5	0
	Democratic Party of Japan (DPJ)	529,819	17.08	0.80	2	0
	Komeito	516,892	16.66	2.58	2	0
	Japan Innovation Party (JIP)	394,306	12.71	5.04	1	1
	Japanese Communist Party (JCP)	285,224	9.19	4.21	1	1
	Party for Future Generations	109,016	3.51	New	0	New
	Social Democratic Party (SDP)	65,349	2.11	0.15	0	0
	Happiness Realization Party (HRP)	18,015	0.58	0.17	0	0
Total		3,102,524	100.00		11
Invalid votes		75,864	2.39
Turnout		3,178,388	51.96	6.38
Registered voters		6,116,465

2012

2012 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,210,400	34.53	2.16	5	1
	Japan Restoration Party (JRP)	622,226	17.75	New	2	New
	Democratic Party of Japan (DPJ)	570,764	16.28	23.45	2	4
	Komeito	493,800	14.08	1.13	2	1
	Your Party	209,627	5.98	New	0	New
	Japanese Communist Party (JCP)	174,648	4.98	0.72	0	0
	Tomorrow Party of Japan (TPJ)	141,360	4.03	New	0	New
	Social Democratic Party (SDP)	68,653	1.96	1.69	0	0
	Happiness Realization Party (HRP)	14,383	0.41	0.34	0	0
Total		3,505,861	100.00		11
Invalid votes		82,531	2.30
Turnout		3,588,392	58.35	12.59
Registered voters		6,150,109

2009

2009 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Democratic Party of Japan (DPJ)	1,704,242	39.73	11.13	6	3
	Liberal Democratic Party (LDP)	1,388,451	32.37	3.45	4	1
	Komeito	555,552	12.95	2.79	1	1
	Japanese Communist Party (JCP)	244,761	5.71	0.20	0	0
	People's New Party (PNP)	208,208	4.85	3.04	0	1
	Social Democratic Party (SDP)	156,291	3.64	1.51	0	0
	Happiness Realization Party (HRP)	32,319	0.75	New	0	New
Total		4,289,824	100.00		11
Invalid votes		106,928	2.43
Turnout		4,396,752	70.94	2.04
Registered voters		6,197,763

2005

2005 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,537,080	36.72	0.69	5	0
	Democratic Party of Japan (DPJ)	1,196,971	28.59	5.21	3	1
	Komeito	658,702	15.74	1.97	2	0
	People's New Party (PNP)	330,546	7.90	New	1	New
	Japanese Communist Party (JCP)	247,073	5.90	0.41	0	0
	Social Democratic Party (SDP)	215,636	5.15	0.38	0	0
Total		4,186,008	100.00		11
Invalid votes		105,032	2.45
Turnout		4,291,040	68.90	7.15
Registered voters		6,228,051

2003

2003 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,388,768	37.41	1.82	5	1
	Democratic Party of Japan (DPJ)	1,254,880	33.80	12.12	4	2
	Komeito	657,311	17.71	2.39	2	0
	Japanese Communist Party (JCP)	234,359	6.31	2.60	0	1
	Social Democratic Party (SDP)	176,942	4.77	4.46	0	1
Total		3,712,260	100.00		11
Invalid votes		120,691	3.15
Turnout		3,832,951	61.74	3.23
Registered voters		6,207,801

2000

2000 results in the Chugoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	1,364,938	35.59	7.23	4	2
	Democratic Party of Japan (DPJ)	831,747	21.68	9.09	2	0
	Komeito	587,603	15.32	New	2	New
	Social Democratic Party (SDP)	353,973	9.23	2.86	1	0
	Japanese Communist Party (JCP)	341,851	8.91	0.75	1	0
	Liberal Party (LP)	340,358	8.87	New	1	New
	Liberal League (LL)	15,164	0.40	New	0	New
Total		3,835,634	100.00		11	2
Invalid votes		165,994	4.15
Turnout		4,001,628	64.97
Registered voters		6,158,811

1996

1996 results in the Chugoku PR block

Party		Votes	%	Seats
	Liberal Democratic Party (LDP)	1,578,140	42.81	6
	New Frontier Party (NFP)	883,319	23.96	3
	Democratic Party (DP)	464,197	12.59	2
	Japanese Communist Party (JCP)	356,108	9.66	1
	Social Democratic Party (SDP)	234,642	6.37	1
	New Socialist Party (NSP)	125,824	3.41	0
	New Party Sakigake (NPS)	43,772	1.19	0
Total		3,686,002	100.00	13