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Nagasaki Prefecture 4th District
Nagasaki Prefecture 4th District
Former Parliamentary constituency; for the Japanese House of Representatives
Prefecture	Nagsaki
Proportional District	Kyushu
Electorate	250,004 (2021)
Former constituency
Created	1994
Abolished	2022

Nagasaki 4th District (長崎県第4区, Nagasaki-ken dai-yon-ku) was a single-member electoral district for the House of Representatives, the lower house of the National Diet of Japan. It was located in western Nagasaki and consisted of the cities of Sasebo, Hirado, Matsuura and Saikai, as well as Kitamatsuura District. As of 2021, 250,004 eligible voters were registered in the district.

List of representatives


Representatives	Party		Dates	Notes
Genjirō Kaneko		LDP	1996–1998	Resigned mid-term to run as Governor of Nagasaki.
Daisuke Miyajima		LDP	1998–2000	Lost re-election.
Seigo Kitamura		Independent	2000–2003	Re-elected in 2003.
Seigo Kitamura		LDP	2003–2009	Re-elected in 2005, 2009 in the Kyushu PR block.
Daisuke Miyajima		DPJ	2009–2012	Lost re-election.
Seigo Kitamura		LDP	2012–2023	Re-elected in 2014, 2017, 2021. Died in office.
Vacant (May – October 2023)
Yōzō Kaneko		LDP	2023–2024	Constituency abolished - moved to the 3rd district

Area covered

The district was redrawn twice between its creation in 1994 and its abolition, once in 2013 and once again in 2017. The district was abolished during redistricting in 2022, and the areas it covered as of 2022 were transferred to the 3rd district.^[2]

Areas 2017–2022

After the 2017 revisions, the areas covered by the district are as follows:^[3]

Sasebo (excluding the Haiki, Mikawachi and Miya Branch Departments)
Hirado, Nagasaki
Matsuura, Nagasaki
Saikai, Nagasaki
Kitamatsuura District
- Saza, Nagasaki

Due to the redrawing of the district borders, Ojika, Nagasaki was moved to the 3rd district, while Saikai was gained from the 2nd district.

Areas 2013–2017

From the redistricting in 2013 until the redistricting in 2017, the areas covered by the district are as follows:^[4]

Sasebo (excluding the Haiki, Mikawachi and Miya Branch Departments)
Hirado, Nagasaki
Matsuura, Nagasaki
Kitamatsuura District

Areas from before 2013

From its formation in 1994, until its first redistricting in 2013, the areas covered by this district were as follows:^[5]

Election results

2023 by-election^[1]
Party		Candidate	Votes	%	±%
	LDP	Yōzō Kaneko (endorsed by Komeito)	53,915	53.5	11.4
	CDP	Seiichi Suetsugu (endorsed by Social Democratic Party)	46,899	46.5	4.7
Turnout			100,814	42.2	12.9
	LDP hold

2021^[1]
Party		Candidate	Votes	%	±%
	LDP	Seigo Kitamura (incumbent) (endorsed by Komeito)	55,968	42.1	8.7
	CDP	Seiichi Suetsugu	55,577	41.8	New
	Independent	Katsu Hagiwara	16,860	12.7	New
	Independent	Ryuji Tanaka	4,765	3.5	New
Turnout			137,702	55.1	2.3
	LDP hold

2017^[6]
Party		Candidate	Votes	%	±%
	LDP	Seigo Kitamura (incumbent) (endorsed by Komeito)	73,899	50.8	0.4
	Kibō no Tō	Daisuke Miyajima (endorsed by the Democratic Party's Nagasaki Prefectural Branch Federation)	61,137	42.0	New
	JCP	Satoru Ishikawa	10,459	7.2	2.0
Turnout			150,036	57.4
	LDP hold

2014^[7]
Party		Candidate	Votes	%	±%
	LDP	Seigo Kitamura (incumbent) (endorsed by Komeito)	61,533	50.4	0.9
	Democratic	Daisuke Miyajima	42,690	35.0	1.2
	People's Life	Seiichi Suetsugu	9,303	7.6	New
	JCP	Satoru Ishikawa	6,319	5.2	New
	Independent	Takuya Mori	2,268	1.9	New
Turnout
	LDP hold

2012^[8]
Party		Candidate	Votes	%	±%
	LDP	Seigo Kitamura (incumbent) (endorsed by Komeito)	81,771	51.3	3.3
	Democratic	Daisuke Miyajima (incumbent) Endorsed by the PNP)	53,918	33.8	16.5
	Tomorrow	Seiichi Suetsugu (endorsed by New Party Daichi)	16,860	12.7	New
	Independent	Ryuji Tanaka	4,765	3.5	New
Turnout
	LDP gain from Democratic

2009^[9]
Party		Candidate	Votes	%	±%
	Democratic	Daisuke Miyajima	97,912	50.3	15.3
	LDP	Seigo Kitamura (incumbent)	93,428	48.0	2.7
	Happiness Realization	Kouichi Yamada	3,354	1.7	New
Turnout
	Democratic gain from LDP

2005^[10]
Party		Candidate	Votes	%	±%
	LDP	Seigo Kitamura (incumbent)	97,174	50.7	10.9
	Democratic	Daisuke Miyajima	67,088	35.0	New
	Social Democratic	Masami Imagawa	27,240	14.2	18.5
Turnout
	LDP hold

2003^[11]
Party		Candidate	Votes	%	±%
	LDP	Seigo Kitamura (incumbent)	100,767	61.6	28.1
	Social Democratic	Masami Imagawa (incumbent - Kyushu)	53,557	32.7	11.4
	JCP	Takenori Nakao	9,284	5.7	0.5
Turnout
	LDP gain from Independent		Swing	19.1

2000^[12]
Party		Candidate	Votes	%	±%
	Independent	Seigo Kitamura	66,515	35.6	*New*
	LDP	Daisuke Miyajima (incumbent)	62,595	33.5	10.1
	Social Democratic	Masami Imagawa	39,808	21.3	2.2
	JCP	Chiaki Yamashita	9,757	5.2	2.0
	Liberal League	Isseu Akagi	8,312	4.5	New
Turnout
	Independent gain from LDP		Swing	N/A

1998 by-election^[13]
Party		Candidate	Votes	%	±%
	LDP	Daisuke Miyajima	86,181	43.6	7.2
	Liberal	Kuro Matsuda	67,614	34.2	New
	Social Democratic	Shoji Yoshimura	37,697	19.1	New
	JCP	Hideki Shimizu	6,282	3.2	0.4
Turnout
	LDP hold		Swing	N/A

1996^[14]
Party		Candidate	Votes	%	±%
	LDP	Genjiro Kaneko (incumbent)	95,117	50.4	*New*
	New Frontier	Kuro Matsuda	56,403	29.9	New
	Democratic	Izumi Yamazaki (incumbent)	29,424	15.6	New
	JCP	Takenori Nakao	7,092	3.8	New
	Liberal League	Keiji Fujinami	825	0.4	New
Turnout
	LDP win (new seat)