Shin Miidera

is a Japanese professional footballer who plays as a midfielder for club Yokohama F. Marinos.

Youth career Miidera was born in Hirosaki, Aomori Prefecture, and began playing football in the second grade of elementary school. He attended Hirosaki Municipal Kita Elementary School and Sendai Municipal Tago Junior High School before enrolling at Daiichi Gakuin High School. He learned a great deal from former professional Nobuyuki Zaizen, who coached him while at FC Fori Classe Sendai. Marinos' team personnel manager and scout Shogo Kobara said that he wanted to sign Miidera as soon as possible due to his high potential, having seen him represent Japan at youth levels and describing him as one of the top players of his generation.

For the 2026–27 season, Miidera is enrolled as a Type 2 player, meaning he can continue to represent youth teams as well as the professional first team.

Miidera made his debut in Marinos' opening league match of the season on 7 August 2026, becoming the youngest player to appear in a J.League season-opener. He scored his first professional goal after seven minutes and was involved in all three of Marinos' goals in a 4–3 defeat. Japan national team manager Hajime Moriyasu praised his performance afterwards. In his third game of the season, against J1 100 Year Vision League champions Vissel Kobe, Miidera scored his second goal for the club helping secure a 1–0 victory.

International career Miidera has represented Japan at U15, U16 and U17 levels.

Style of play Miidera is a left-footed midfielder who can play in multiple attacking positions.