# Hokkaido 10th district

Hokkaidō 10th district (北海道[第]10区) is a single-member electoral district for the House of Representatives, the lower house of the National Diet of Japan.
The district is located in the prefecture (-dō) of Hokkaidō and represents the municipalities within Hokkaido's Sorachi and Rumoi subprefectures, as well as the towns of Horokanai (formerly within Sorachi, now a part of Kamikawa Subprefecture) and Horonobe (formerly within Rumoi, now a part of Sōya Subprefecture).

## History

The district was created in 1994 when the current system of single-member districts was introduced and first contested in the 1996 general election. It was formed from portions of the former 2nd and 4th districts that had existed under the multi-member system since 1947. In 1996 the seat was won by Democratic Party of Japan member Tadamasa Kodaira, who had been one of the representatives of the former 4th district since 1990. Kodaira retained the seat at the following four elections, until his loss to Komeito candidate Hisashi Inatsu at the 2012 general election. Inatsu retained the seat in subsequent elections until 2024.

## List of representatives

| Representative | Party | Dates | Notes |
| Tadamasa Kodaira | DPJ | 1996 – 2012 | Also lost in the PR block |
| Hisashi Inatsu | KM | 2012 – 2024 | |
| Hiroshi Kamiya | CDP | 2024 – | |

## Recent results

2024 :
| Party | Party | Candidate | Votes | % | ±% |
| | CDP | Hiroshi Kamiya (PR seat incumbent) | 78,362 | 50.77 | 4.70 |
| | Komeito | Hisashi Inatsu (incumbent) | 75,990 | 49.23 | 4.70 |
| Majority | Majority | Majority | 2,352 | 1.54 | |
| Registered electors | Registered electors | Registered electors | 267,329 | | |
| Turnout | Turnout | Turnout | | 59.90 | 4.90 |
| | CDP gain from Komeito | CDP gain from Komeito | CDP gain from Komeito | CDP gain from Komeito | CDP gain from Komeito |
2021 :
| Party | Party | Candidate | Votes | % | ±% |
| | Komeito | Hisashi Inatsu (incumbent) (endorsed by the Liberal Democratic Party and New Party Daichi) | 96,843 | 53.93 | 3.8 |
| | CDP | Hiroshi Kamiya (elected via PR) | 82,718 | 46.07 | 3.8 |
| Majority | Majority | Majority | | 7.8 | 7.6 |
| Turnout | Turnout | Turnout | | 64.80 | 1.36 |
| | Komeito hold | Komeito hold | Swing | 3.8 | |
2017 :
| Party | Party | Candidate | Votes | % | ±% |
| | Komeito | Hisashi Inatsu (incumbent) (endorsed by the Liberal Democratic Party and New Party Daichi) | 96,795 | 50.1 | 1.6 |
| | CDP | Hiroshi Kamiya (elected via PR) | 96,282 | 49.9 | 10.1 |
| Majority | Majority | Majority | 513 | 0.2 | 8.5 |
| Turnout | Turnout | Turnout | | 65.16 | 6.31 |
| | Komeito hold | Komeito hold | Swing | 4.3 | |
2014 :
| Party | Party | Candidate | Votes | % |
| | Komeito | Hisashi Inatsu (incumbent) (endorsed by the Liberal Democratic Party) | 86,722 | 48.5 |
| | Democratic | Hiroshi Kamiya | 71,219 | 39.8 |
| | JCP | Kenji Kimura | 20,803 | 11.6 |
| Turnout | Turnout | Turnout | | 58.85 |
2012 :
| Party | Candidate | Votes | % |
| Komeito | Hisashi Inatsu (PR block incumbent) (endorsed by the Liberal Democratic Party) | 107,937 | 47.5 |
| Democratic | Tadamasa Kodaira (incumbent) (endorsed by the People's New Party) | 62,998 | 30.9 |
| NP-Daichi | Takahiro Asano [ja] (PR block incumbent) (endorsed by the Tomorrow Party of Japan) | 39,918 | 19.5 |
| JCP | Kenji Kimura | 13,320 | 6.5 |
2009 :
| Party | Candidate | Votes | % |
| Democratic | Tadamasa Kodaira (incumbent) | 159,473 | 62.5 |
| LDP | Yukari Iijima (PR block incumbent) | 89,287 | 35.1 |
| Happiness Realization | Makoto Obayashi | 6,114 | 2.4 |
2005 :
| Party | Candidate | Votes | % |
| Democratic | Tadamasa Kodaira (incumbent) | 109,422 | 62.5 |
| Independent | Takafumi Yamashita [ja] (PR block incumbent) | 78,604 | 29.4 |
| LDP | Yukari Iijima (elected to PR block) | 62,100 | 2.4 |
| JCP | Tateo Tani | 17,617 | 6.6 |