Patent ID: 7719822

Claim:
An electrolytic capacitor comprising: a capacitor element formed of a rolled stack of an anode member, a cathode member and a separator sheet placed therebetween; an anode lead electrically connected to the anode member; a cathode lead electrically connected to the cathode member; and a seat plate having a first through-hole to pass the anode lead, a second through-hole to pass the cathode lead, a first groove provided around the first through-hole, and a second groove provided around the second through-hole, wherein the anode lead bent along the seat plate is placed along the first groove, the cathode lead bent along the seat plate is placed along the second groove, wherein the first groove includes a first wide portion having a width wider than the width of the anode lead around the first through-hole, and a first narrow portion having a width substantially equal to the width of the anode lead at one end of the seat plate, and the second groove includes a second wide portion having a width wider than the width of the cathode lead around the second through-hole, and a second narrow portion having a width substantially equal to the width of the cathode lead at the other end of the seat plate, wherein the first narrow portion has a same width over constant length, and the second narrow portion has a same width over constant length.