Disclosed is an extract of Perilla frutescens seeds that contains rosmarinic acid, luteolin, and apigenin, the weight ratio between rosmarinic acid, luteolin, and apigenin being 0.1-200:0.1-200:1. Also disclosed is a method for treating a psychiatric disorder using the above-described extract or an extract of Perilla frutescens seeds containing at least an active agent selected from the group consisting of rosmarinic acid, luteolin, and apigenin.