Kotaro Yamahara is a 25-year-old professional football player from JPN. He currently plays for Thespa Kusatsu Gunma, wearing the number 16 shirt. He plays primarily as a Defender. He stands at 182cm tall and weighs 75kg. His preferred foot is Right. His current market value is estimated at 175K .

His most recent move was a Transfer from Ehime FC to Thespa Kusatsu Gunma on 2026-07-01.

Throughout the J2/J3 100 Year Vision League 2026, Kotaro Yamahara featured in 2 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.