Keisuke Sonoi is a Japanese actor who was active primarily during the 1960s. He appeared in a diverse range of Shōwa-era studio productions, spanning genres from crime dramas like The Shape of Night to cult science fiction and horror features such as The X from Outer Space and Genocide.

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Keisuke Sonoi is a Japanese actor who built a prolific filmography within studio cinema during the 1960s.
He is best known for his supporting roles in mid-century Japanese cinema, notably the cult science fiction features The X from Outer Space and Genocide.
He appeared across a wide range of genres typical of Shōwa-era Japanese filmmaking, spanning drama, crime, romance, and science fiction.