2023 Wakayama 1st district by-election was held on 23 April 2023 because Shuhei Kishimoto resigned as a member of the House of Representatives.

However, Kishimoto announced his candidacy for 2022 Wakayama Prefecture gubernatorial election and left the DPFP and resigned as a member of the House of Representatives.

Instead, the Nippon Ishin no Kai, which aims to expand its influence in the Kansai region, nominated Yumi Hayashi, a member of the Wakayama city Council, as a candidate.

[4][5] On the other hand, the ruling Liberal Democratic Party tried to nominate Yōsuke Tsuruho, a member of the House of Councillors from Wakayama at-large district, but failed.

Eventually, the LDP nominated Hirofumi Kado, a former member of the House of Representatives elected by the Kinki proportional representation block, who had lost to Kishimoto four times in the Wakayama 1st district.