The Shikoku proportional representation block () 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.

Results timeline Vote share Party 1996 2000 2003 2005 2009 2012 2014 2017 2021 2024 2026 LDP 41.61 35.97 38.23 38.29 31.98 30.66 34.85 35.92 39.14 31.01 42.04 NFP 24.18 DPJ 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 4.15 SDP 7.06 10.08 5.30 5.55 4.20 2.31 2.12 1.85 1.78 1.57 1.14 Komeito 13.70 16.69 14.80 13.03 14.97 15.78 14.69 13.74 12.72 LP 8.35 Ishin 21.32 12.79 4.87 10.23 6.67 7.37 Your 5.03 TPJ 3.45 KnT 20.10 CDP 14.45 17.18 18.17 DPFP 7.19 15.09 12.99 Reiwa 3.12 6.20 3.00 Sanseitō 2.85 8.40 CRA 18.23 CPJ 2.69 Others 2.07 0.27 0.87 0.44 3.52 0.77 1.25 Turnout 61.87 57.64 66.11 69.96 57.99 49.70 50.70 55.48 51.98 55.58

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 2026 6

List of representatives Years Elected representatives 1996 Naoaki Haruna Masanori Gotō Kazuyoshi Endō Shōzō Nishimura Ihei Ochidied 2000, replaced byAkira 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 Gotōresigned 2005, replaced byMiho 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 2026 + 2026 results in the Shikoku PR block Party Votes Swing % Seats +/– Liberal Democratic Party (LDP) 691,402 42.04 11.03 4 1 Centrist Reform Alliance (CRA) 299,777 18.23 12.66 1 1 Democratic Party For the People (DPFP) 213,661 12.99 2.10 1 0 Sanseitō 138,187 8.40 5.55 0 0 Japan Innovation Party (Ishin) 121,217 7.37 0.70 0 0 Japanese Communist Party (JCP) 68,324 4.15 1.55 0 0 Reiwa Shinsengumi (Reiwa) 49,267 3.00 3.20 0 0 Conservative Party of Japan (CPJ) 44,284 2.69 New 0 New Social Democratic Party (SDP) 18,674 1.14 0.43 0 0 Total 1,644,793 100.00 6 Invalid votes 38,292 2.28 Turnout 1,683,085 55.58 3.60 Registered voters 3,028,194

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

References

JANJAN, The Senkyo: Results of general and by-elections for the House of Representatives 1890–2010

Notes