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	LDP
Representative	Yasumasa Nagasaka
Municipalities	Ama, Aisai, Inazawa, Tsushima, Yatomi, and Ama District.

PrefectureAichi

Proportional DistrictTokai

Electorate381,372^[1]

Created1994

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.

[1]

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
2026	Yasumasa Nagasaka	LDP

Party		Candidate	Votes	%	±%
	LDP	Yasumasa Nagasaka	93,351	45.1	3.6
	Centrist Reform	Mitsunori Okamoto	58.084	28.1	19.8
	Ishin	Nana Uragami	24,489	11.8
	Sanseitō	Taichi Katō	22,098	10.7
	JCP	Keiko Itō	8,930	4.3	6.2
Registered electors			374,810
Turnout				56.11	4.10
	LDP gain from Centrist Reform

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

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

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

Aichi 9th district

since 2022

2013 - 2022

1994 - 2013

List of representatives

Election results

2026

2024

2021

2017

2014

2012

2009

2005

2003

2000

1996

References

Related Articles

Timelines

Top Qs

Fact Checks

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^[1]
Current constituency
Created	1994
Seats	One
Party	LDP
Representative	Yasumasa Nagasaka
Municipalities	Ama, Aisai, Inazawa, Tsushima, Yatomi, and Ama District.

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

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 [ja]	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

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

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

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

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

Party		Candidate	Votes	%	±%
	New Frontier	Toshiki Kaifu	111,578	47.68	New
	Liberal Democratic	Hiroshi Yoshikawa	58,059	24.81	New
	Democratic	Kanju Sato [ja]	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 [ja]	338	0.14	New
Majority			53,519	22.87
Turnout
	New Frontier win (new seat)

v t e Aichi's electoral districts for the Diet of Japan
FPTP "small" districts (1996–present) 1 2 3 4 5 6 7 8 9 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)

v t e 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: Eisuke Mori, Chiba 11th Vice Speaker of the House of Representatives of Japan: Keiichi Ishii, Northern Kanto 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 9 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