Leaf spot and leaf decay disease of perilla (Perilla frutescens) has been found on harvested perilla leaves at market of Osaka in summer season of 1990. The spots of perilla leaf were circular and black, sometimes leaves were decayed. Isolated fungi formed singly or in chains of conidia on an apex of conidiophore on perilla leaf. Conidia were straight to curved, cylindrical to obclavate. The isolated fungi infected soybean, lotus lily, eggplant, and several tropical plants which described in Wei's report. According to these characteristics, the fungus was identified as Corynespora cassiicola (Berk. & Curt.) Wei. We propose the name of Corynespora leaf spot disease of perilla.