Aichi 9th district

Aichi 9th district
Aichi 9th district
Parliamentary constituency; for the Japanese House of Representatives
	Numbered map of Aichi Prefecture single-member districts
Prefecture	Aichi
Proportional District	Tokai
Electorate	381,372
Current constituency
Created	1994
Seats	One
Party	CDP
Representative	Mitsunori Okamoto
Municipalities	Ama, Aisai, Inazawa, Tsushima, Yatomi, and Ama District.

Aichi 9th district (愛知県第9区, Aichi-ken dai-kyuku or simply 愛知9区, Aichi-ken kyuku) is a single-member constituency of the House of Representatives in the national Diet of Japan located in Aichi Prefecture.

Areas covered

List of representatives

Election	Representative
1996^[7]	Toshiki Kaifu	New Frontier
1996^[7]		Liberal
2000^[8]		New Conservative
2003^[9]		New Conservative
2005^[10]		LDP
2009^[11]	Mitsunori Okamoto	Democratic
2012^[12]	Yasumasa Nagasaka	LDP
2014^[13]
2017^[14]
2021^[15]
2024^[16]	Mitsunori Okamoto	CDP

Election results

2024 • 2021 • 2017 • 2014 • 2012 • 2009 • 2005 • 2003 • 2000 • 1996

2024

2024^[16]
Party		Candidate	Votes	%	±%
	CDP	Mitsunori Okamoto	91,152	48.03
	LDP	Yasumasa Nagasaka (incumbent) (won PR seat)	78,726	41.48
	JCP	Keiko Ito	19,899	10.49	N/A
Majority			12,426	6.55
Registered electors			377,902
Turnout				52.01	1.97
	CDP gain from LDP

2021

2021^[15]
Party		Candidate	Votes	%	±%
	Liberal Democratic (endorsed by Komeito)	Yasumasa Nagasaka (incumbent)	120,213	52.74
	CDP	Mitsunori Okamoto (PR seat incumbent)	107,722	47.26	New
Majority			12,491	5.48
Registered electors			432,760
Turnout				53.98	2.03
	LDP hold

2017

2017^[14]
Party		Candidate	Votes	%	±%
	Liberal Democratic (endorsed by Komeito)	Yasumasa Nagasaka (incumbent)	104,419	47.50
	Kibō no Tō	Mitsunori Okamoto (PR seat incumbent) (won PR seat)	89,908	40.90	New
	Communist	Hiroshi Watanabe	25,489	11.60
Majority			14,511	6.60
Registered electors			435,193
Turnout				51.95	1.15
	LDP hold

2014

2014^[13]
Party		Candidate	Votes	%	±%
	Liberal Democratic (endorsed by Komeito)	Yasumasa Nagasaka (incumbent)	98,594	47.27
	Democratic	Mitsunori Okamoto (won PR seat)	85,967	41.22
	Communist	Hiroshi Watanabe	24,003	11.51
Majority			12,627	6.05
Registered electors			424,434
Turnout				50.80	7.20
	LDP hold

2012

2012^[12]
Party		Candidate	Votes	%	±%
	Liberal Democratic (endorsed by Komeito)	Yasumasa Nagasaka	93,757	39.40
	Democratic (endorsed by PNP)	Mitsunori Okamoto (incumbent)	62,033	26.07
	Restoration (endorsed by Your)	Masayasu Nakano	46,739	19.64	New
	Tomorrow (endorsed by Daichi)	Makoto Igeta	20,244	8.51	New
	Communist	Shozo Matsuzaki	15,186	6.38	N/A
Majority			31,724	13.33
Registered electors			423,038
Turnout				58.00	12.30
	LDP gain from Democratic

2009

2009^[11]
Party		Candidate	Votes	%	±%
	Democratic	Mitsunori Okamoto (PR seat incumbent)	180,609	62.42
	Liberal Democratic	Toshiki Kaifu (incumbent)	100,549	34.75
	Happiness Realization	Kimiko Itaya	8,200	2.83	New
Majority			80,060	27.67
Registered electors			421,977
Turnout				70.30	3.15
	Democratic gain from LDP

2005

2005^[10]
Party		Candidate	Votes	%	±%
	Liberal Democratic	Toshiki Kaifu (incumbent)	130,771	47.66	N/A
	Democratic	Mitsunori Okamoto (PR seat incumbent) (won PR seat)	110,809	40.38
	Communist	Shozo Matsuzaki	17,489	6.37
	People's New	Makoto Igeta	15,314	5.58	New
Majority			19,962	7.28
Registered electors			417,340
Turnout				67.15	9.26
	LDP hold

2003

2003^[9]
Party		Candidate	Votes	%	±%
	New Conservative	Toshiki Kaifu (incumbent)	104,075	44.59
	Democratic	Mitsunori Okamoto (won PR seat)	92,554	39.65
	Independent	Makoto Igeta	20,565	8.81	New
	Communist	Shozo Matsuzaki	16,213	6.95
Majority			11,521	4.94
Registered electors			414,797
Turnout				57.89
	New Conservative hold

2000

2000^[8]
Party		Candidate	Votes	%	±%
	New Conservative	Toshiki Kaifu (incumbent)	122,175	53.16	New
	Democratic	Yoshie Meguro	73,321	31.90	New
	Communist	Shozo Matsuzaki	24,266	10.56
	Independent	Katsuyuki Ōmiya	6,117	2.66	New
	Liberal League	Yoshiaki Yamazaki	3,936	1.71	New
Majority			48,854	21.26
Turnout
	New Conservative hold

1996

1996^[7]
Party		Candidate	Votes	%	±%
	New Frontier	Toshiki Kaifu	111,578	47.68	New
	Liberal Democratic	Hiroshi Yoshikawa	58,059	24.81	New
	Democratic	Kanju Sato	42,393	18.12	New
	Communist	Shizuo Hibi	20,290	8.67	New
	Culture Forum	Reiko Yasuda	921	0.39	New
	Independent	Tadanori Ōi	422	0.18	New
	People's Party	Sakae Shirai	338	0.14	New
Majority			53,519	22.87
Turnout
	New Frontier win (new seat)

References

^ Ministry of Internal Affairs and Communications (MIC): [1] (in Japanese)
^ "衆議院トップページ >立法情報 >制定法律情報 >第210回国会　制定法律の一覧 >公職選挙法の一部を改正する法律法律第八十九号（令四・一一・二八）". House of Representatives of Japan. 2022-11-28. Retrieved 2023-02-23.
^ "愛知県" (PDF). Ministry of Internal Affairs and Communications. Retrieved 2023-01-09.
^ "衆議院トップページ >立法情報 >制定法律情報 >第183回国会　制定法律の一覧 >衆議院小選挙区選出議員の選挙区間における人口較差を緊急に是正するための公職選挙法及び衆議院議員選挙区画定審議会設置法の一部を改正する法律の一部を改正する法律法律第六十八号（平二五・六・二八）". House of Representatives of Japan. 2013-06-28. Retrieved 2021-10-02.
^ "愛知県" (PDF). Ministry of Internal Affairs and Communications. Retrieved 2021-10-02.
^ "衆議院トップページ >立法情報 >制定法律情報 >第131回国会　制定法律の一覧 >法律第百四号（平六・一一・二五）". House of Representatives of Japan. 1994-11-25. Retrieved 2021-10-02.
^ ^a ^b "第41回衆議院議員選挙 - 愛知9区". Senkyo.com (in Japanese). Retrieved 2023-10-29.
^ ^a ^b "第42回衆議院議員選挙 - 愛知9区". Senkyo.com (in Japanese). Retrieved 2023-10-29.
^ ^a ^b "第43回衆議院議員選挙 - 愛知9区". Senkyo.com (in Japanese). Retrieved 2023-10-29.
^ ^a ^b "第44回衆議院議員選挙 - 愛知9区". the Asahi Shinbun (in Japanese). Retrieved 2023-10-29.
^ ^a ^b "第45回衆議院議員選挙 - 愛知9区". the Asahi Shinbun (in Japanese). Retrieved 2023-10-29.
^ ^a ^b "開票結果小選挙区愛知". Yomiuri Shimbun (in Japanese). Retrieved 2023-10-29.
^ ^a ^b "2014衆院選:衆議院選挙:選挙アーカイブス:NHK選挙WEB". NHK (in Japanese). Retrieved 2023-10-29.
^ ^a ^b "2017衆院選:衆議院選挙:選挙アーカイブス:NHK選挙WEB". Yomiuri Shimbun (in Japanese). Retrieved 2023-10-08.
^ ^a ^b "2021年衆議院総選挙　愛知9区". NHK (in Japanese). Retrieved 2023-10-08.
^ ^a ^b "2024年衆議院総選挙　愛知10区". NHK (in Japanese). Retrieved 2024-11-15.

[1] Ministry of Internal Affairs and Communications (MIC): [1] (in Japanese)

[2] "衆議院トップページ >立法情報 >制定法律情報 >第210回国会　制定法律の一覧 >公職選挙法の一部を改正する法律法律第八十九号（令四・一一・二八）". House of Representatives of Japan. 2022-11-28. Retrieved 2023-02-23.

[3] "愛知県" (PDF). Ministry of Internal Affairs and Communications. Retrieved 2023-01-09.

[4] "衆議院トップページ >立法情報 >制定法律情報 >第183回国会　制定法律の一覧 >衆議院小選挙区選出議員の選挙区間における人口較差を緊急に是正するための公職選挙法及び衆議院議員選挙区画定審議会設置法の一部を改正する法律の一部を改正する法律法律第六十八号（平二五・六・二八）". House of Representatives of Japan. 2013-06-28. Retrieved 2021-10-02.

[5] "愛知県" (PDF). Ministry of Internal Affairs and Communications. Retrieved 2021-10-02.

[6] "衆議院トップページ >立法情報 >制定法律情報 >第131回国会　制定法律の一覧 >法律第百四号（平六・一一・二五）". House of Representatives of Japan. 1994-11-25. Retrieved 2021-10-02.

[elect96-7] "第41回衆議院議員選挙 - 愛知9区". Senkyo.com (in Japanese). Retrieved 2023-10-29.

[elect00-8] "第42回衆議院議員選挙 - 愛知9区". Senkyo.com (in Japanese). Retrieved 2023-10-29.

[elect03-9] "第43回衆議院議員選挙 - 愛知9区". Senkyo.com (in Japanese). Retrieved 2023-10-29.

[elect05-10] "第44回衆議院議員選挙 - 愛知9区". the Asahi Shinbun (in Japanese). Retrieved 2023-10-29.

[elect09-11] "第45回衆議院議員選挙 - 愛知9区". the Asahi Shinbun (in Japanese). Retrieved 2023-10-29.

[elect12-12] "開票結果小選挙区愛知". Yomiuri Shimbun (in Japanese). Retrieved 2023-10-29.

[elect14-13] "2014衆院選:衆議院選挙:選挙アーカイブス:NHK選挙WEB". NHK (in Japanese). Retrieved 2023-10-29.

[elect17-14] "2017衆院選:衆議院選挙:選挙アーカイブス:NHK選挙WEB". Yomiuri Shimbun (in Japanese). Retrieved 2023-10-08.

[elect21-15] "2021年衆議院総選挙　愛知9区". NHK (in Japanese). Retrieved 2023-10-08.

[elect24-16] "2024年衆議院総選挙　愛知10区". NHK (in Japanese). Retrieved 2024-11-15.

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Aichi's electoral districts for the Diet of Japan
FPTP "small" districts (1996–present) 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 PR part of the Tōkai PR block (21 seats) House of Councillors At-large (15→16 Representatives, 6→8 Councillors)
SNTV "medium-sized" districts (1947–1993) 1 2 3 4 5 6 (19→22 Representatives, 6 Councillors)
Limited voting "large" districts (1946) 1 2 (18 Representatives)
SNTV "medium-sized" districts (1928–1942) 1 2 3 4 5 (17 Representatives)
FPTP/SNTV "small" districts (1920–1924) 1 2 3 4 5 6 7 8 9 10 11 12 13 (17 Representatives)
SNTV "large" districts (1902–1917) Nagoya city counties (gunbu) (13 Representatives)
FPTP/bloc voting "small" districts (1890–1898) 1 2 3 4 5 6 7 8 9 10 11 (11 Representatives)

First-past-the-post (FPTP) districts and proportional representation (PR) "blocks" for the Japanese House of Representatives of the National Diet (1996–present)
Speaker of the House of Representatives of Japan: Fukushiro Nukaga, Ibaraki 2nd Vice Speaker of the House of Representatives of Japan: Banri Kaieda, Tokyo PR
Hokkaidō	Block 8 seats Hokkaidō 1 2 3 4 5 6 7 8 9 10 11 12
Tōhoku	Block 12 seats Aomori 1 2 3 Iwate 1 2 3 Miyagi 1 2 3 4 5 Akita 1 2 3 Yamagata 1 2 3 Fukushima 1 2 3 4
Kita- (North) Kantō	Block 19 seats Ibaraki 1 2 3 4 5 6 7 Tochigi 1 2 3 4 5 Gunma 1 2 3 4 5 Saitama 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Minami- (South) Kantō	Block 23 seats Chiba 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Kanagawa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Yamanashi 1 2
Tokyo	Block 19 seats Tokyo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Hokuriku-Shin'etsu	Block 10 seats Niigata 1 2 3 4 5 Toyama 1 2 3 Ishikawa 1 2 3 Fukui 1 2 Nagano 1 2 3 4 5
Tōkai	Block 21 seats Gifu 1 2 3 4 5 Shizuoka 1 2 3 4 5 6 7 8 Aichi 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 Mie 1 2 3 4
Kinki	Block 28 seats Shiga 1 2 3 Kyoto 1 2 3 4 5 6 Osaka 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Hyōgo 1 2 3 4 5 6 7 8 9 10 11 12 Nara 1 2 3 Wakayama 1 2
Chūgoku	Block 10 seats Tottori 1 2 Shimane 1 2 Okayama 1 2 3 4 Hiroshima 1 2 3 4 5 6 Yamaguchi 1 2 3
Shikoku	Block 6 seats Tokushima 1 2 Kagawa 1 2 3 Ehime 1 2 3 Kōchi 1 2
Kyūshū	Block 20 seats Fukuoka 1 2 3 4 5 6 7 8 9 10 11 Saga 1 2 Nagasaki 1 2 3 Kumamoto 1 2 3 4 Ōita 1 2 3 Miyazaki 1 2 3 Kagoshima 1 2 3 4 Okinawa 1 2 3 4
Former districts	Abolished in 2002 Hokkaido 13 Yamagata 4 Shizuoka 9 Shimane 3 Oita 4 Abolished in 2013 Fukui 3 Yamanashi 3 Tokushima 3 Kochi 3 Saga 3 Abolished in 2017 Aomori 4 Iwate 4 Mie 5 Nara 4 Kumamoto 5 Kagoshima 5 Abolished in 2022 Miyagi 6 Fukushima 5 Niigata 6 Shiga 4 Wakayama 3 Okayama 5 Hiroshima 7 Yamaguchi 4 Ehime 4 Nagasaki 4