Provided is an electrolytic capacitor having a cathode that exhibits a high capacity. The electrolytic capacitor includes: a cathode having a conductive substrate and a conductive polymer layer placed on a surface of the conductive substrate; an anode having a substrate composed of a valve metal and a dielectric layer composed of an oxide of the valve metal that is placed on the surface of the substrate and is so placed that the dielectric layer and the conductive polymer layer of the cathode face each other through a space; and an ion-conductive electrolyte filled in the space, in which the conductive polymer layer of the cathode that is in contact with the ion-conductive electrolyte expresses a redox capacity by applying a voltage between the anode and the cathode.