Afterwards, he founded the film making company 'Sozo-sha,' not only with his wife Koyama, Fumio WATANABE and Takeshi TAMURA (Oshima's assistant director, later known as a playwright) who left Shochiku CO., Ltd., at the same time, but also with Hosei KOMATSU and Rokko TOURA.
その後、同時に松竹を退社した妻の小山や渡辺文雄、大島の助監督でその後脚本家として活動する田村孟らに加え、小松方正、戸浦六宏らと共に映画制作会社「創造社」を創設する。