Patent ID: 8767377

Claim:
An electrolytic capacitor comprising: a capacitor element including: an anode foil having a dielectric layer on a surface of the anode foil; a cathode foil confronting the anode foil; a separator interposed between the anode foil and the cathode foil; and a solid electrolytic layer formed of an aggregate of fine particles of conductive polymer on the surface of the anode foil, a surface of the cathode foil, and a surface of the separator; an electrolyte solution impregnated into the capacitor element; and an outer package enclosing the capacitor element and the electrolyte solution together therein, wherein the separator has an air-tightness falling within a range from 0.5 s/100 ml to 2.0 s/100 ml, inclusive, wherein sizes of the fine particles fall within a range from 25 nm to 100 nm, inclusive and an amount of the fine particles contained falls within a range from 0.3 mg/cm 2 to 1.2 mg/cm 2 , inclusive, as converted to weight per unit area of the anode foil.