Koshiyama Keitatsu was born on April 21, 2009, in Tokyo Metropolis, Japan. He is a Japanese male actor. In 2015, he debuted as a child actor. In addition to his acting career, he also participated in activities with EBiDAN NEXT and worked as a male model for the teen magazine Nico Puchi. On April 29, 2020, his first television drama, FAKE MOTION -King of Table Tennis-, aired. In 2023, the manga adaptation series Tengu's Kitchen, in which he starred, was broadcast. In 2024, his first leading role in a feature film, My Sunshine, was selected for the 77th Cannes International Film Festival. For this film, he received multiple awards, including the 49th Japan Movie Critics Award Newcomer Award, the 98th Kinema Junpo Award Best Newcomer, and the 48th Japan Academy Film Prize Best Newcomer. In 2025, the drama film Kokuho and the school drama The School Rules of the Planet We Don't Know Yet, in which he appeared, were broadcast. In 2026, the TBS Television drama Gift, in which he appeared, began airing.
