# Nagasaki 4th district

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.

### Areas 2017–2022

After the 2017 revisions, the areas covered by the district are as follows:
* 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:
* 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:
* Sasebo
* Hirado
* Matsuura
* Kitamatsuura District

## Election results

2023 by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | Yōzō Kaneko (endorsed by Komeito) | 53,915 | 53.5 | 11.4 |
| | Constitutional Democratic | Seiichi Suetsugu (endorsed by Social Democratic Party) | 46,899 | 46.5 | 4.7 |
| Turnout | Turnout | Turnout | 100,814 | 42.2 | 12.9 |
| | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold |
2021 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | Seigo Kitamura (incumbent) (endorsed by Komeito) | 55,968 | 42.1 | 8.7 |
| | Constitutional Democratic | Seiichi Suetsugu | 55,577 | 41.8 | New |
| | Independent | Katsu Hagiwara | 16,860 | 12.7 | New |
| | Independent | Ryuji Tanaka | 4,765 | 3.5 | New |
| Turnout | Turnout | Turnout | 137,702 | 55.1 | 2.3 |
| | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold |
2017 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | 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 |
| | Communist | Satoru Ishikawa | 10,459 | 7.2 | 2.0 |
| Turnout | Turnout | Turnout | 150,036 | 57.4 | |
| | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold |
2014 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | 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 |
| | Communist | Satoru Ishikawa | 6,319 | 5.2 | New |
| | Independent | Takuya Mori | 2,268 | 1.9 | New |
| Turnout | Turnout | Turnout | | | |
| | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold |
2012 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | 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 | Turnout | Turnout | | | |
| | Liberal Democratic gain from Democratic | Liberal Democratic gain from Democratic | Liberal Democratic gain from Democratic | Liberal Democratic gain from Democratic | Liberal Democratic gain from Democratic |
2009 :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Daisuke Miyajima | 97,912 | 50.3 | 15.3 |
| | Liberal Democratic | Seigo Kitamura (incumbent) | 93,428 | 48.0 | 2.7 |
| | Happiness Realization | Kouichi Yamada | 3,354 | 1.7 | New |
| Turnout | Turnout | Turnout | | | |
| | Democratic gain from Liberal Democratic | Democratic gain from Liberal Democratic | Democratic gain from Liberal Democratic | Democratic gain from Liberal Democratic | Democratic gain from Liberal Democratic |
2005 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | 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 | Turnout | Turnout | | | |
| | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold | Liberal Democratic hold |
2003 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | Seigo Kitamura (incumbent) | 100,767 | 61.6 | 28.1 |
| | Social Democratic | Masami Imagawa (incumbent - Kyushu) | 53,557 | 32.7 | 11.4 |
| | Communist | Takenori Nakao | 9,284 | 5.7 | 0.5 |
| Turnout | Turnout | Turnout | | | |
| | Liberal Democratic gain from Independent | Liberal Democratic gain from Independent | Swing | 19.1 | |
2000 :
| Party | Party | Candidate | Votes | % | ±% |
| | Independent | Seigo Kitamura | 66,515 | 35.6 | New |
| | Liberal Democratic | Daisuke Miyajima (incumbent) | 62,595 | 33.5 | 10.1 |
| | Social Democratic | Masami Imagawa | 39,808 | 21.3 | 2.2 |
| | Communist | Chiaki Yamashita | 9,757 | 5.2 | 2.0 |
| | Liberal League | Isseu Akagi | 8,312 | 4.5 | New |
| Turnout | Turnout | Turnout | | | |
| | Independent gain from Liberal Democratic | Independent gain from Liberal Democratic | Swing | N/A | |
1998 by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | 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 |
| | Communist | Hideki Shimizu | 6,282 | 3.2 | 0.4 |
| Turnout | Turnout | Turnout | | | |
| | Liberal Democratic hold | Liberal Democratic hold | Swing | N/A | |
1996 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic | 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 |
| | Communist | Takenori Nakao | 7,092 | 3.8 | New |
| | Liberal League | Keiji Fujinami | 825 | 0.4 | New |
| Turnout | Turnout | Turnout | | | |
| | Liberal Democratic win (new seat) | Liberal Democratic win (new seat) | Liberal Democratic win (new seat) | Liberal Democratic win (new seat) | Liberal Democratic win (new seat) |