Yamanashi 1st district

Yamanashi 1st district (山梨[県第]1区, Yamanashi[-ken dai-]ikku) is a single-member electoral district for the House of Representatives, the lower house of the National Diet of Japan located in western Yamanashi Prefecture. As of September 2022 it had 424,557 eligible voters.

Before the introduction of single-member districts in the 1990s, all of Yamanashi had formed one at-large district that elected five members to the House of Representatives. After the last House of Representatives election under the old system in 1993, Representatives from Yamanashi included Liberal Democrat Eiichi Nakao, Socialist Azuma Koshiishi and reformist Sakihito Ozawa. Nakao and Koshiishi contested the new 1st district in 1996: Nakao won. Koshiishi was elected to the Diet in the 1998 election to represent Yamanashi in the House of Councillors. In the 2000 Representatives election, Ozawa challenged Nakao and unseated him. He held onto the seat until 2012 when he joined the Japan Restoration Party and lost the district to Liberal Democratic newcomer Noriko Miyagawa, a former junior high school teacher.

Area

Cities

Kōfu (prefectural capital)
Nirasaki
Minami-Alps
Hokuto
Kai
Chūō

Towns

Yamanashi lost one electoral constituency in reapportionment in 2013. Previously, the 1st district covered Kōfu, Enzan, Yamanashi City and Higashiyamanashi District. In September 2012, 218,115 voters were registered in the district, giving its voters one of the highest vote weights in the country.^[1]

List of representatives

Representative		Dates	Notes
Eiichi Nakao	LDP	1996 – 2000
Sakihito Ozawa	DPJ	2000 – 2012	Joined Japan Restoration Party in 2012 Re-elected in the S. Kantō PR block
Noriko Miyagawa	LDP	2012 – 2014	Re-elected in the S. Kantō PR block
Katsuhito Nakajima	DPJ	2014 – 2016
	DP	2016 – 2017
	Independent	2017 – 2021	Re-elected in the S. Kantō PR block
Shin'ichi Nakatani	LDP	2021 –

Election results

2024^[2]
Party		Candidate	Votes	%	±%
	CDP	Katsuhito Nakajima	107,050	45.87	1.73
	LDP	Shin'ichi Nakatani (elected by PR)	99,129	42.48	5.12
	Sanseitō	Akihiro Takada	14,597	6,25
	JCP	Soda Norifumi	12,601	5.40
Turnout			233,377	56.69	2.80
	CDP gain from LDP

2021^[3]
Party		Candidate	Votes	%	±%
	LDP	Shin'ichi Nakatani	125,325	50.5	6.6
	CDP	Katsuhito Nakajima (elected by PR)	118,223	47.6	3.3
	Anti-NHK	Nobuyuki Henmi	4,826	1.9
Turnout				59.49	1.99
	LDP gain from CDP

2017^[4]
Party		Candidate	Votes	%	±%
	Independent	Katsuhito Nakajima	107,007	44.3	0.3
	LDP	Shin'ichi Nakatani (elected by PR)	105,876	43.9	0.4
	JCP	Gen Miyauchi	21,320	8.8	3.7
	Happiness Realization	Ai Nishiwaki	7,119	3.0
Turnout				57.50	1.24
	Independent hold

2014^[5]
Party		Candidate	Votes	%	±%
	Democratic	Katsuhito Nakajima	102,111	44.0	23.7
	LDP	Noriko Miyagawa (elected by PR)	101,026	43.5	0.1
	JCP	Akiko Endō	29,125	12.5	4.0
Turnout				56.26	4.00
	Democratic gain from LDP

2012^[6]
	Candidate	Votes	%	±%
LDP – Kōmeitō	Noriko Miyagawa	54,930	43.6	new
JRP – YP	Sakihito Ozawa (elected by PR)	34,414	27.3	−32.9
DPJ – PNP	Tsuyoshi Saitō	26,070	20.7	new
JCP	Michitaka Uemura	10,694	8.5	new

2009^[7]
	Candidate	Votes	%	±%
DPJ	Sakihito Ozawa	91,422	60.2	+12.7
LDP – Kōmeitō	Masaaki Akaike	46,881	30.9	−13.3
JCP	Akiko Endō	11,972	7.9	−0.3
HRP	Hiroyuki Hayase	1,480	1.0	new

2005^[8]
	Candidate	Votes	%	±%
DPJ	Sakihito Ozawa	70,281	47.5	−7.4
LDP – Kōmeitō	Masaaki Akaike (elected by PR)	65,426	44.2	new
JCP	Akiko Endō	12,173	8.2	−2.2

2003^[9]
	Candidate	Votes	%	±%
DPJ	Sakihito Ozawa	71,623	54.9	+12.9
LDP	Kenzō Yoneda	45,282	34.7	new
JCP	Akiko Endō	13,545	10.4	+1.4

2000^[10]
	Candidate	Votes	%	±%
DPJ	Sakihito Ozawa	58,781	42.0	new
LDP	Eiichi Nakao	52,964	37.8	−1.1
Independent	Nobuaki Akaike	15,803	11.3	new
JCP	Akiko Endō	12,538	9.0	new

1996^[11]
	Candidate	Votes	%	±%
LDP	Eiichi Nakao	52,111	38.9	N/A
DPJ	Azuma Koshiishi	45,288	33.8	N/A
NFP	Hitoshi Gotō	25,265	18.9	N/A
JCP	Susumu Kogoshi	10,610	7.9	N/A
LL	Shigemoto Ishikawa	753	0.6	N/A

References

^ Ministry of general affairs: 平成24年9月2日現在選挙人名簿及び在外選挙人名簿登録者数 [Number of registered voters and overseas voters as of September 2, 2012] (in Japanese)
^ 日本放送協会. "衆議院選挙2024 埼玉(川越・越谷など)開票速報・選挙結果 NHK". www.nhk.or.jp (in Japanese). Retrieved 2025-03-31.
^ 小選挙区山梨１区 [Single-seat constituency Yamanashi 1st district] (in Japanese). NHK. 2021. Retrieved 25 June 2023.
^ 小選挙区山梨１区 [Single-seat constituency Yamanashi 1st district] (in Japanese). NHK. 2017. Retrieved 25 June 2023.
^ 2014年12月14日(日) 投票小選挙区山梨１区 [Vote on Sunday, December 14, 2014 Single-seat constituency Yamanashi 1st district] (in Japanese). NHK. Retrieved 25 June 2023.
^ 総選挙2012>開票結果小選挙区山梨 [General Election 2012>Vote Counting Results Single-Seat Constituency Yamanashi]. Yomiuri Shimbun (in Japanese). Retrieved 2013-02-09.
^ 総選挙2009>開票速報小選挙区山梨 [General Election 2009>Election Count Report Single-Seat Constituency Yamanashi]. Yomiuri Shimbun (in Japanese). Retrieved 2013-02-09.
^ 総選挙2005>開票速報小選挙区山梨 [General Election 2005>Election Count Report Single-Seat Constituency Yamanashi]. Yomiuri Shimbun (in Japanese). Retrieved 2013-02-09.
^ 第43回衆議院議員選挙 - 山梨1区 [43rd House of Representatives Election - Yamanashi 1st District]. go2senkyo.com (in Japanese). Heartbeats Corp. Retrieved 2013-02-09.
^ 第42回衆議院議員選挙 - 山梨1区 [42nd House of Representatives Election - Yamanashi 1st District]. go2senkyo.com (in Japanese). Heartbeats Corp. Retrieved 2013-02-09.
^ 第41回衆議院議員選挙 - 山梨1区 [41st House of Representatives Election - Yamanashi 1st District]. go2senkyo.com (in Japanese). Heartbeats Corp. Retrieved 2013-02-09.

[1] Ministry of general affairs: 平成24年9月2日現在選挙人名簿及び在外選挙人名簿登録者数 [Number of registered voters and overseas voters as of September 2, 2012] (in Japanese)

[2] 日本放送協会. "衆議院選挙2024 埼玉(川越・越谷など)開票速報・選挙結果 NHK". www.nhk.or.jp (in Japanese). Retrieved 2025-03-31.

[3] 小選挙区山梨１区 [Single-seat constituency Yamanashi 1st district] (in Japanese). NHK. 2021. Retrieved 25 June 2023.

[4] 小選挙区山梨１区 [Single-seat constituency Yamanashi 1st district] (in Japanese). NHK. 2017. Retrieved 25 June 2023.

[5] 2014年12月14日(日) 投票小選挙区山梨１区 [Vote on Sunday, December 14, 2014 Single-seat constituency Yamanashi 1st district] (in Japanese). NHK. Retrieved 25 June 2023.

[6] 総選挙2012>開票結果小選挙区山梨 [General Election 2012>Vote Counting Results Single-Seat Constituency Yamanashi]. Yomiuri Shimbun (in Japanese). Retrieved 2013-02-09.

[7] 総選挙2009>開票速報小選挙区山梨 [General Election 2009>Election Count Report Single-Seat Constituency Yamanashi]. Yomiuri Shimbun (in Japanese). Retrieved 2013-02-09.

[8] 総選挙2005>開票速報小選挙区山梨 [General Election 2005>Election Count Report Single-Seat Constituency Yamanashi]. Yomiuri Shimbun (in Japanese). Retrieved 2013-02-09.

[9] 第43回衆議院議員選挙 - 山梨1区 [43rd House of Representatives Election - Yamanashi 1st District]. go2senkyo.com (in Japanese). Heartbeats Corp. Retrieved 2013-02-09.

[10] 第42回衆議院議員選挙 - 山梨1区 [42nd House of Representatives Election - Yamanashi 1st District]. go2senkyo.com (in Japanese). Heartbeats Corp. Retrieved 2013-02-09.

[11] 第41回衆議院議員選挙 - 山梨1区 [41st House of Representatives Election - Yamanashi 1st District]. go2senkyo.com (in Japanese). Heartbeats Corp. Retrieved 2013-02-09.

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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 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