In 2003, Yoshida ran for Yokosuka's assembly election, in which he was the youngest candidate and won the most votes. He was reelected in 2007, gaining more votes than any other candidate again.
In the mayoral election held on 28 June 2009, Yoshida beat Ryōichi Kabaya, a former government official and the incumbent mayor backed by former Prime Minister Junichirō Koizumi and three major political parties. His victory, making him the first mayor of Yokosuka who has no bureaucratic background since 1973, is seen as a blow to the prospects for Shinjirō Koizumi, Junichirō Koizumi's second son, who plans to run for the coming national election.
- "Koizumi-backed incumbent loses Yokosuka mayoral race". Kyodo News. Kyodo. 29 June 2009. Retrieved 30 June 2009.
- Shinkai, Hiroshi (29 June 2009). 小泉神通力に陰り 横須賀市長に吉田さん 30代旋風『王国』にサプライズ. The Tokyo Shimbun - Tokyo Web (in Japanese). Chunichi Shimbun. Archived from the original on July 1, 2009. Retrieved 30 June 2009.
- 吉田雄人の略歴. The Official Website of Yūto Yoshida (in Japanese). Retrieved 30 June 2009.
- "Koizumi's candidate knocked out as mayor". The Japan Times Online. Kyodo. 30 June 2009. Retrieved 30 June 2009.
- 吉田市議が所属会派を離団、市長選出馬への動きか. Kanaloco (in Japanese). Kanagawa Shimbun. Kyodo. 9 March 2009. Archived from the original on 17 July 2011. Retrieved 30 June 2009.
- Yoshida, Masaru (29 June 2009). 選挙：横須賀市長選 吉田氏が初当選. The Mainichi Shimbun (in Japanese). Retrieved 30 June 2009.[dead link]
- Official website (in Japanese)
|Mayor of Yokosuka
10 July 2009–present
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