Shikoku proportional representation block

The Shikoku proportional representation block (Hirei [daihyō] Shikoku burokku (比例[代表]四国ブロック)) is one of eleven proportional representation (PR) "blocks", multi-member constituencies for the House of Representatives in the Diet of Japan. It consists of Shikoku region covering Tokushima, Kagawa, Ehime and Kōchi Prefectures. Following the introduction of proportional voting it elected seven representatives in the 1996 general election. When the total number of PR seats was reduced from 200 to 180, the Shikoku PR block shrank to six seats.

Shikoku Proportional Representation Block
Parliamentary constituency for the Japanese House of Representatives
Map of House of Representatives proportional blocks, with the Shikoku block highlighted
Prefectures	Ehime, Kagawa, Kōchi, and Tokushima
Electorate	3,073,592 (2024)
Current constituency
Representatives	6

Results timeline

Vote share

Party		1996	2000	2003	2005	2009	2012	2014	2017	2021	2024
	LDP	41.61	35.97	38.23	38.29	31.98	30.66	34.85	35.92	39.14	31.01
	NFP	24.18
	DPJ[a]	13.03	20.66	31.74	33.17	43.23	16.05	20.82
	JCP	12.06	10.97	8.04	8.20	6.67	5.78	10.12	7.37	6.36	5.70
	SDP	7.06	10.08	5.30	5.55	4.20	2.31	2.12	1.85	1.78	1.57
	Komeito		13.70	16.69	14.80	13.03	14.97	15.78	14.69	13.74	12.72
	LP		8.35
	Ishin[b]						21.32	12.79	4.87	10.23	6.67
	Your						5.03
	TPJ						3.45
	KnT								20.10
	CDP								14.45	17.18	18.17
	DPFP									7.19	15.09
	Reiwa									3.12	6.20
	Sanseitō										2.85
Others		2.07[c]	0.27[d]			0.87[e]	0.44[f]	3.52[g]	0.77[h]	1.25[i]
Turnout			61.87	57.64	66.11	69.96	57.99	49.70	50.70	55.48	51.98

Seat distribution

Election	Distribution	Seats
1996		7
2000		6
2003		6
2005		6
2009		6
2012		6
2014		6
2017		6
2021		6
2024		6

List of representatives

Years	Elected representatives
1996	Naoaki Haruna	Masanori Gotō	Kazuyoshi Endō	Shōzō Nishimura	Ihei Ochi died 2000, replaced by Akira Shichijō	Mamoru Nishida	Hajime Morita
2000	Naoaki Haruna	Masanori Gotō	Kazuyoshi Endō	Mamoru Nishida	Hajime Morita	Akira Shichijō	–
2003	Miho Takai	Masanori Gotō	Noritoshi Ishida	Hajime Morita	Yoshirō Okamoto	Akira Shichijō
2005	Junya Ogawa	Masanori Gotō resigned 2005, replaced by Miho Takai	Noritoshi Ishida	Akira Shichijō	Yoshirō Okamoto	Katsuko Nishimoto
2009	Hirobumi Niki	Takako Nagae	Hideyuki Takahashi	Noritoshi Ishida	Takuya Hirai	Shun'ichi Yamaguchi
2012	Junya Ogawa	Fumiki Sakurauchi	Arata Nishioka	Noritoshi Ishida	Takakazu Seto	Yasuji Izuhara
2014	Junya Ogawa	Hiroyuki Yokoyama	Noritoshi Ishida	Teru Fukui	Takakazu Seto	Mamoru Fukuyama

Election results

2024

2024 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	479,835	31.01	8.13	3	0
	Constitutional Democratic Party of Japan (CDP)	281,209	18.17	0.99	1	0
	Democratic Party For the People (DPFP)	233,515	15.09	7.90	1	1
	Komeito	196,765	12.72	1.02	1	0
	Japan Innovation Party (Ishin)	103,237	6.67	3.56	0	1
	Reiwa Shinsengumi (Reiwa)	95,973	6.20	3.09	0	0
	Japanese Communist Party (JCP)	88,224	5.70	0.66	0	0
	Sanseitō	44,127	2.85	New	0	New
	Social Democratic Party (SDP)	24,361	1.57	0.21	0	0
Total		1,547,246	100.00		6
Invalid votes		50,347	3.15
Turnout		1,597,593	51.98	3.50
Registered voters		3,073,592

2021

2021 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	664,805	39.14	3.22	3	0
	Constitutional Democratic Party of Japan (CDP)	291,871	17.18	2.74	1	0
	Komeito	233,407	13.74	0.95	1	0
	Japan Innovation Party (Ishin)	173,826	10.23	5.37	1	1
	Democratic Party For the People (DPFP)	122,082	7.19	New	0	New
	Japanese Communist Party (JCP)	108,021	6.36	1.01	0	0
	Reiwa Shinsengumi (Reiwa)	52,941	3.12	New	0	New
	Social Democratic Party (SDP)	30,249	1.78	0.07	0	0
	NHK Party	21,285	1.25	New	0	New
Total		1,698,487	100.00		6
Invalid votes		62,480	3.55
Turnout		1,760,967	55.48	4.78
Registered voters		3,174,258

2017

2017 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	579,225	35.92	1.07	3	0
	Kibō no Tō	324,106	20.10	New	1	New
	Komeito	236,863	14.69	1.09	1	0
	Constitutional Democratic Party of Japan (CDP)	232,965	14.45	New	1	New
	Japanese Communist Party (JCP)	118,826	7.37	2.75	0	0
	Japan Innovation Party (Ishin)	78,500	4.87	New	0	New
	Social Democratic Party (SDP)	29,818	1.85	0.27	0	0
	Happiness Realization Party (HRP)	12,356	0.77	0.08	0	0
Total		1,612,659	100.00		6
Invalid votes		46,262	2.79
Turnout		1,658,921	50.70	1.00
Registered voters		3,272,184

2014

2014 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	547,185	34.85	4.20	3	1
	Democratic Party of Japan (DPJ)	326,803	20.82	4.77	1	0
	Komeito	247,776	15.78	0.82	1	0
	Japan Innovation Party (JIP)	200,882	12.79	8.52	1	1
	Japanese Communist Party (JCP)	158,848	10.12	4.34	0	0
	Party for Future Generations	44,515	2.84	New	0	New
	Social Democratic Party (SDP)	33,257	2.12	0.19	0	0
	Happiness Realization Party (HRP)	10,762	0.69	0.24	0	0
Total		1,570,028	100.00		6
Invalid votes		49,834	3.08
Turnout		1,619,862	49.70	8.29
Registered voters		3,259,284

2012

2012 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	567,193	30.66	1.33	2	0
	Japan Restoration Party (JRP)	394,393	21.32	New	2	New
	Democratic Party of Japan (DPJ)	296,914	16.05	27.20	1	2
	Komeito	276,907	14.97	1.94	1	0
	Japanese Communist Party (JCP)	106,976	5.78	0.89	0	0
	Your Party	93,090	5.03	New	0	New
	Tomorrow Party of Japan (TPJ)	63,830	3.45	New	0	New
	Social Democratic Party (SDP)	42,762	2.31	1.89	0	0
	Happiness Realization Party (HRP)	8,171	0.44	0.43	0	0
Total		1,850,236	100.00		6
Invalid votes		58,365	3.06
Turnout		1,908,601	57.99	11.97
Registered voters		3,291,313

2009

2009 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Democratic Party of Japan (DPJ)	973,038	43.24	10.08	3	1
	Liberal Democratic Party (LDP)	719,594	31.98	6.31	2	1
	Komeito	293,204	13.03	1.77	1	0
	Japanese Communist Party (JCP)	150,171	6.67	1.53	0	0
	Social Democratic Party (SDP)	94,558	4.20	1.35	0	0
	Happiness Realization Party (HRP)	19,507	0.87	New	0	New
Total		2,250,072	100.00		6
Invalid votes		83,071	3.56
Turnout		2,333,143	69.96	3.85
Registered voters		3,334,875

2005

2005 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	821,746	38.29	0.06	3	0
	Democratic Party of Japan (DPJ)	711,927	33.17	1.43	2	0
	Komeito	317,575	14.80	1.90	1	0
	Japanese Communist Party (JCP)	175,994	8.20	0.16	0	0
	Social Democratic Party (SDP)	119,089	5.55	0.24	0	0
Total		2,146,331	100.00		6
Invalid votes		85,434	3.83
Turnout		2,231,765	66.11	8.48
Registered voters		3,375,693

2003

2003 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	708,051	38.23	2.26	3	0
	Democratic Party of Japan (DPJ)	587,828	31.74	11.08	2	1
	Komeito	309,160	16.69	3.00	1	0
	Japanese Communist Party (JCP)	148,953	8.04	2.93	0	1
	Social Democratic Party (SDP)	98,243	5.30	4.77	0	0
Total		1,852,235	100.00		6
Invalid votes		92,906	4.78
Turnout		1,945,141	57.64	4.24
Registered voters		3,374,840

2000

2000 results in the Shikoku PR block

Party		Votes	Swing	%	Seats	+/–
	Liberal Democratic Party (LDP)	700,719	35.97	5.64	3	0
	Democratic Party of Japan (DPJ)	402,457	20.66	7.63	1	0
	Komeito	266,791	13.70	New	1	New
	Japanese Communist Party (JCP)	213,729	10.97	1.08	1	0
	Social Democratic Party (SDP)	196,277	10.08	3.02	0	0
	Liberal Party (LP)	162,700	8.35	New	0	New
	Liberal League (LL)	5,316	0.27	New	0	New
Total		1,947,989	100.00		6	1
Invalid votes		128,824	6.20
Turnout		2,076,813	61.87
Registered voters		3,356,478

1996

1996 results in the Shikoku PR block

Party		Votes	%	Seats
	Liberal Democratic Party (LDP)	783,589	41.61	3
	New Frontier Party (NFP)	455,269	24.18	2
	Democratic Party (DP)	245,323	13.03	1
	Japanese Communist Party (JCP)	227,014	12.06	1
	Social Democratic Party (SDP)	132,868	7.06	0
	New Socialist Party (NSP)	39,067	2.07	0
Total		1,883,130	100.00	7