To provide a capacitor capable of achieving cost reduction as compared with before.

A capacitor includes a film casing 20 constituted of a film 21 having steam barrier properties, and a capacitor element 30 is wrapped with the film casing 20. For that reason, steam (moisture) around the film casing 20 can be prevented from intruding into the casing 20 by the film casing 20. Accordingly, an epoxy resin can be abolished, differently from conventional art. Then, cost reduction by shortening of cycle time can be achieved as compared with before.