Japanese writer who, with Kawabata Yasunari, was one of the mainstays of the New Sensationalist school (Shinkankaku-ha) of Japanese writers, influenced by the avant-garde trends in European literature of the 1920s.

Yokomitsu began writing while still at Waseda University, Tokyo, which he left without graduating. In 1923 he joined the playwright Kikuchi Kan's (Kikuchi Kan) journal Bungei shunjū. In 1924 he joined Kawabata in publishing the journal Bungei jidai (both can be translated “Literary Age”). Yokomitsu's story Atama narabi ni hara (“Heads and Bellies”), published there that year, was hailed as a new kind of writing. In opposition to the autobiographical legacy of naturalism and the social pleading of proletarian literature, Yokomitsu developed an aesthetic of sensual impressions presented in fresh, startling ways. Haru wa basha ni notte (1926; Spring Came on a Horse-Drawn Cart), dealing with his wife's fatal illness, is a lyrical, sensitive story; Kikai (1930; Machine) shows his growing obsession with the idea of a mechanistic principle governing human behaviour. Concerned always with the theory of writing, he put forth his ideas in Junsui shōsetsu ron (1935; “On the Pure Novel”).