# 1959 Japanese House of Councillors election

House of Councillors elections were held in Japan on 2 June 1959, electing half the seats in the House. The Liberal Democratic Party won the most seats. Kōji Harashima, who later become a founding member and the first chairman of Kōmeitō, was elected to the Diet for the first time as one of several Soka Gakkai-affiliated independents.
During the campaign, Prime Minister Nobusuke Kishi and MITI began to discuss the now-famous "income doubling" plan, although it was temporarily shelved due to disputes between party factions and the looming importance of the US–Japan Security Treaty revision issue. The plan would not be revived until the tenure of Hayato Ikeda, beginning in 1960.

## Results

Seats :
| Party | Party | Votes | % | Seats | Votes | % | Seats | Not up | Won | Total after | +/– |
| | Liberal Democratic Party | 12,120,598 | 41.20 | 22 | 15,667,022 | 52.00 | 49 | 61 | 71 | 132 | +10 |
| | Japan Socialist Party | 7,794,754 | 26.49 | 17 | 10,265,394 | 34.07 | 21 | 47 | 38 | 85 | +5 |
| | Ryokufūkai | 2,382,703 | 8.10 | 4 | 731,383 | 2.43 | 2 | 5 | 6 | 11 | –20 |
| | Political League for Small and Medium Enterprises | 598,519 | 2.03 | 1 | | | | 0 | 1 | 1 | New |
| | Japanese Communist Party | 551,916 | 1.88 | 1 | 999,255 | 3.32 | 0 | 2 | 1 | 3 | +1 |
| | Other parties | 154,743 | 0.53 | 0 | 155,189 | 0.52 | 0 | 0 | 0 | 0 | 0 |
| | Independents | 5,817,187 | 19.77 | 7 | 2,311,112 | 7.67 | 3 | 8 | 10 | 18 | +4 |
| Total | Total | 29,420,420 | 100.00 | 52 | 30,129,355 | 100.00 | 75 | 123 | 127 | 250 | 0 |
| Valid votes | Valid votes | 29,420,420 | 93.59 | | 30,129,355 | 95.83 | | | | | |
| Invalid/blank votes | Invalid/blank votes | 2,016,244 | 6.41 | | 1,310,398 | 4.17 | | | | | |
| Total votes | Total votes | 31,436,664 | 100.00 | | 31,439,753 | 100.00 | | | | | |
| Registered voters/turnout | Registered voters/turnout | 53,516,473 | 58.74 | | 53,516,473 | 58.75 | | | | | |
| Source: Ministry of Internal Affairs and Communications, National Diet ||||||||||||

### By constituency

| Prefecture | Total seats | Seats won | Seats won | Seats won | Seats won | Seats won | Seats won |
| Prefecture | Total seats | LDP | JSP | Ryokufūkai | JCP | PLSME | Ind. |
| Aichi | 3 | 2 | 1 | | | | |
| Akita | 1 | 1 | | | | | |
| Aomori | 1 | | | 1 | | | |
| Chiba | 2 | 1 | 1 | | | | |
| Ehime | 1 | 1 | | | | | |
| Fukui | 1 | 1 | | | | | |
| Fukuoka | 3 | 2 | 1 | | | | |
| Fukushima | 2 | 1 | 1 | | | | |
| Gifu | 1 | 1 | | | | | |
| Gunma | 2 | 1 | 1 | | | | |
| Hiroshima | 2 | 1 | 1 | | | | |
| Hokkaido | 4 | 2 | 2 | | | | |
| Hyōgo | 3 | 2 | 1 | | | | |
| Ibaraki | 2 | 1 | 1 | | | | |
| Ishikawa | 1 | | | | | | 1 |
| Iwate | 1 | 1 | | | | | |
| Kagawa | 1 | 1 | | | | | |
| Kagoshima | 2 | 2 | | | | | |
| Kanagawa | 2 | 1 | 1 | | | | |
| Kōchi | 1 | 1 | | | | | |
| Kumamoto | 2 | 2 | | | | | |
| Kyoto | 2 | 1 | 1 | | | | |
| Mie | 1 | 1 | | | | | |
| Miyagi | 1 | 1 | | | | | |
| Miyazaki | 1 | 1 | | | | | |
| Nagano | 2 | 1 | 1 | | | | |
| Nagasaki | 1 | 1 | | | | | |
| Nara | 1 | 1 | | | | | |
| Niigata | 2 | 1 | 1 | | | | |
| Ōita | 1 | 1 | | | | | |
| Okayama | 2 | 1 | 1 | | | | |
| Osaka | 3 | 1 | 2 | | | | |
| Saga | 1 | 1 | | | | | |
| Saitama | 2 | 1 | 1 | | | | |
| Shiga | 1 | | | 1 | | | |
| Shimane | 1 | 1 | | | | | |
| Shizuoka | 2 | 2 | | | | | |
| Tochigi | 2 | 1 | 1 | | | | |
| Tokushima | 1 | 1 | | | | | |
| Tokyo | 4 | 2 | | | | | 2 |
| Tottori | 1 | | 1 | | | | |
| Toyama | 1 | 1 | | | | | |
| Wakayama | 1 | 1 | | | | | |
| Yamagata | 1 | 1 | | | | | |
| Yamaguchi | 1 | 1 | | | | | |
| Yamanashi | 1 | | 1 | | | | |
| National | 52 | 22 | 17 | 4 | 1 | 1 | 7 |
| Total | 127 | 71 | 38 | 6 | 7 | 7 | 10 |