# Aichi 9th district

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.

## Areas covered
### since 2022

* Ama
* Aisai
* Inazawa
* Tsushima
* Yatomi
* Ama District

### 2013 - 2022

* Part of Ichinomiya
** Former Bisai area
* Ama
* Aisai
* Inazawa
* Tsushima
* Yatomi
* Ama District

### 1994 - 2013

* Bisai
* Inazawa
* Tsushima
* Ama District
* Nakashima District

## List of representatives

| Election | Representative | Party |
| 1996 | Toshiki Kaifu | New Frontier |
| 1996 | Toshiki Kaifu | Liberal |
| 2000 | Toshiki Kaifu | New Conservative |
| 2003 | Toshiki Kaifu | New Conservative |
| 2005 | Toshiki Kaifu | LDP |
| 2009 | Mitsunori Okamoto | Democratic |
| 2012 | Yasumasa Nagasaka [ja] | LDP |
| 2014 | Yasumasa Nagasaka [ja] | LDP |
| 2017 | Yasumasa Nagasaka [ja] | LDP |
| 2021 | Yasumasa Nagasaka [ja] | LDP |
| 2024 | Mitsunori Okamoto | CDP |

## Election results
### 2024

2024 :
| Party | Party | Candidate | Votes | % | ±% |
| | CDP | Mitsunori Okamoto | 91,152 | 48.03 | |
| | LDP | Yasumasa Nagasaka [ja] (incumbent) (won PR seat) | 78,726 | 41.48 | |
| | JCP | Keiko Ito | 19,899 | 10.49 | N/A |
| Majority | Majority | Majority | 12,426 | 6.55 | |
| Registered electors | Registered electors | Registered electors | 377,902 | | |
| Turnout | Turnout | Turnout | | 52.01 | 1.97 |
| | CDP gain from LDP | CDP gain from LDP | CDP gain from LDP | CDP gain from LDP | CDP gain from LDP |

### 2021

2021 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic (endorsed by Komeito) | Yasumasa Nagasaka [ja] (incumbent) | 120,213 | 52.74 | |
| | CDP | Mitsunori Okamoto (PR seat incumbent) | 107,722 | 47.26 | New |
| Majority | Majority | Majority | 12,491 | 5.48 | |
| Registered electors | Registered electors | Registered electors | 432,760 | | |
| Turnout | Turnout | Turnout | | 53.98 | 2.03 |
| | LDP hold | LDP hold | LDP hold | LDP hold |

### 2017

2017 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic (endorsed by Komeito) | Yasumasa Nagasaka [ja] (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 | Majority | Majority | 14,511 | 6.60 | |
| Registered electors | Registered electors | Registered electors | 435,193 | | |
| Turnout | Turnout | Turnout | | 51.95 | 1.15 |
| | LDP hold | LDP hold | LDP hold | LDP hold |

### 2014

2014 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic (endorsed by Komeito) | Yasumasa Nagasaka [ja] (incumbent) | 98,594 | 47.27 | |
| | Democratic | Mitsunori Okamoto (won PR seat) | 85,967 | 41.22 | |
| | Communist | Hiroshi Watanabe | 24,003 | 11.51 | |
| Majority | Majority | Majority | 12,627 | 6.05 | |
| Registered electors | Registered electors | Registered electors | 424,434 | | |
| Turnout | Turnout | Turnout | | 50.80 | 7.20 |
| | LDP hold | LDP hold | LDP hold | LDP hold |

### 2012

2012 :
| Party | Party | Candidate | Votes | % | ±% |
| | Liberal Democratic (endorsed by Komeito) | Yasumasa Nagasaka [ja] | 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 | Majority | Majority | 31,724 | 13.33 | |
| Registered electors | Registered electors | Registered electors | 423,038 | | |
| Turnout | Turnout | Turnout | | 58.00 | 12.30 |
| | LDP gain from Democratic | LDP gain from Democratic | LDP gain from Democratic | LDP gain from Democratic | LDP gain from Democratic |

### 2009

2009 :
| Party | 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 | Majority | Majority | 80,060 | 27.67 | |
| Registered electors | Registered electors | Registered electors | 421,977 | | |
| Turnout | Turnout | Turnout | | 70.30 | 3.15 |
| | Democratic gain from LDP | Democratic gain from LDP | Democratic gain from LDP | Democratic gain from LDP | Democratic gain from LDP |

### 2005

2005 :
| Party | 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 | Majority | Majority | 19,962 | 7.28 | |
| Registered electors | Registered electors | Registered electors | 417,340 | | |
| Turnout | Turnout | Turnout | | 67.15 | 9.26 |
| | LDP hold | LDP hold | LDP hold | LDP hold |

### 2003

2003 :
| Party | 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 | Majority | Majority | 11,521 | 4.94 | |
| Registered electors | Registered electors | Registered electors | 414,797 | | |
| Turnout | Turnout | Turnout | | 57.89 | |
| | New Conservative hold | New Conservative hold | New Conservative hold | New Conservative hold |

### 2000

2000 :
| Party | 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 | Majority | Majority | 48,854 | 21.26 | |
| Turnout | Turnout | Turnout | | | |
| | New Conservative hold | New Conservative hold | New Conservative hold | New Conservative hold |

### 1996

1996 :
| Party | 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 | Majority | Majority | 53,519 | 22.87 | |
| Turnout | Turnout | Turnout | | | |
| | New Frontier win (new seat) | New Frontier win (new seat) | New Frontier win (new seat) | New Frontier win (new seat) |