# Kumamoto 4th district

Kumamoto 4th District (熊本県第4区, Kumamoto-ken dai-yon-ku, or 熊本4区 Kumamoto yon-ku) is a current single-member electoral district for the House of Representatives, the lower house of the National Diet of Japan. It is located in Kumamoto and since 2017 covers roughly the Southern half of Kumamoto.
Before 2013, it consisted of a small section of the prefectural capital Kumamoto (the former towns of Tomiai and Jōnan in today's Minami-ku), the cities of Amakusa, Uto, Kami-Amakusa and Uki and the remaining towns and villages of the former Amakusa, Upper (Kami-Mashiki) and Lower Mashiki (Shimo-Mashiki) counties. As of September 2012, 294,547 eligible voters were resident in the district.
Before 1996, the area had been part of the four-member Kumamoto 2nd district. Representatives had included Sunao Sonoda (DPJ→PDP→Progressive→JDP→LDP, 1947–1984) and his son Hiroyuki (LDP→NPH, 1986–1996). Hiroyuki Sonoda, deputy chief cabinet secretary during the LDP-JSP-NPH coalition, won the new single-member 4th district six times in a row after the electoral reform. In several elections, he was not even challenged by a candidate from the major party of the opposing bloc, exceptions were the initial election of 1996 and the "postal election" of 2005. In 2012, neither of the two established major parties contested the seat. Sonoda's main challenger in 2012, Masayoshi Yagami, had become a Liberal Democrat (JNP→NFP→LDP) when he represented the neighbouring 5th district in the 1990s, but became an independent for his two terms as mayor of Sagara and his failed run for governor of Kumamoto in 2008.

## List of representatives

| Representative | Party | Dates | Notes |
| Hiroyuki Sonoda | NPS | 1996–2000 | Became independent in 1998, returned to the LDP in 1999 |
| Hiroyuki Sonoda | LDP | 2000–2012 | Joined SPJ in 2010, merged into SP, then JRP in 2012 |
| Hiroyuki Sonoda | JRP | 2012–2014 | Co-founded the Party for Future Generations in 2014 |
| Hiroyuki Sonoda | PJK | 2014–2017 | Returned to LDP in 2015, moved to the Kyūshū PR block in the 2017 election |
| Yasushi Kaneko | LDP | 2017– | Represented the abolished Kumamoto 5th district 2000–2017 |

## Election results

2024 :
| Party | Party | Candidate | ±% |
| | LDP | Yasushi Kaneko | |
| | CDP | Yukiko Sasamoto | |
| | Ishin | Masayoshi Yagami | New |
| Turnout | Turnout | Turnout | |
2021 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Yasushi Kaneko | 155,572 | 68.1 | 5.3 |
| | CDP | Masayoshi Yagami | 72,966 | 31.9 | 5.3 |
| Turnout | Turnout | Turnout | 232,464 | 57.50 | 0.51 |
| | LDP hold | LDP hold | LDP hold | LDP hold |
2017 :
| Party | Party | Candidate | Votes | % |
| | LDP | Yasushi Kaneko | 150,453 | 62.8 |
| | CDP | Masayoshi Yagami (won seat in the Kyūshū PR block) | 89,279 | 37.2 |
| Turnout | Turnout | Turnout | 247,233 | 58.01 |
| | LDP hold | LDP hold | LDP hold | LDP hold |
2014 :
| Party | Party | Candidate | Votes | % | ±% |
| | Japanese Kokoro | Hiroyuki Sonoda | 101,581 | 75.9 | +10.0 |
| | JCP | Eiji Iseri | 32,223 | 24.1 | new |
| Turnout | Turnout | Turnout | | | |
| | Japanese Kokoro gain from Restoration | Japanese Kokoro gain from Restoration | Swing | | |
2012 :
| Party | Party | Candidate | Votes | % | ±% |
| | Restoration | Hiroyuki Sonoda | 102,975 | 65.9 | +6.7 |
| | Independent | Masayoshi Yagami | 36,652 | 23.5 | new |
| | JCP | Yōko Minoda | 16,585 | 10.6 | new |
| Turnout | Turnout | Turnout | | | |
| | Restoration gain from LDP | Restoration gain from LDP | Swing | | |
2009 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Hiroyuki Sonoda | 123,900 | 59.2 | −9.1 |
| | People's New | Shin'ichi Matsunaga | 78,811 | 37.6 | new |
| | Happiness Realization | Ichirō Kōno | 6,668 | 3.2 | new |
| Turnout | Turnout | Turnout | | | |
| | LDP hold | LDP hold | Swing | | |
2005 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Hiroyuki Sonoda | 136,380 | 68.3 | −5.3 |
| | Democratic | Motosuke Matsumoto | 63,169 | 31.7 | new |
| Turnout | Turnout | Turnout | | | |
| | LDP hold | LDP hold | Swing | | |
2003 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Hiroyuki Sonoda | 137,428 | 73.6 | −5.6 |
| | Social Democratic | Ikuo Morikawa | 36,977 | 19.8 | new |
| | JCP | Shimako Iseri | 12,262 | 6.6 | new |
| Turnout | Turnout | Turnout | | | |
| | LDP hold | LDP hold | Swing | | |
2000 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Hiroyuki Sonoda | 149,156 | 79.2 | +20.2 |
| | Liberal League | Kōji Wakaki (? 若城浩史) | 21,028 | 11.2 | new |
| | JCP | Keiichi Fukuda | 18,188 | 9.7 | new |
| Turnout | Turnout | Turnout | | | |
| | LDP gain from NP-Sakigake | LDP gain from NP-Sakigake | Swing | | |
1996 :
| Party | Party | Candidate | Votes | % | ±% |
| | NP-Sakigake | Hiroyuki Sonoda | 117,441 | 59.0 | N/A |
| | New Frontier | Kimihiro Yasuda | 73,231 | 36.8 | N/A |
| | JCP | Nobuhiro Yamamoto | 8,511 | 4.3 | N/A |
| Turnout | Turnout | Turnout | | | |
| | NP-Sakigake win (new seat) | NP-Sakigake win (new seat) | NP-Sakigake win (new seat) | NP-Sakigake win (new seat) | NP-Sakigake win (new seat) |