Electrolytic capacitor

Abstract

Disclosed is an electrolytic capacitor that includes: a wound capacitor element which is formed by winding a laminate; a liquid component with which the capacitor element is impregnated; and a bottomed cylindrical case which houses the capacitor element and the liquid component. The laminate has: an anode foil which has a dielectric layer on the surface thereof; a cathode foil which faces the dielectric layer of the anode foil; a separator which is interposed between the anode foil and the cathode foil; and a conductive polymer which is held by the separator. In a cross-section that is perpendicular to the winding axis of the capacitor element, the ratio of the total cross-sectional area of the anode foil and the cathode foil to the cross-sectional area of the capacitor element is 55% or more.