Patent ID: 7612986

Claim:
An aluminum electrolytic capacitor, wherein a capacitor anode in which a dielectric film and a solid electrolyte layer are formed on at least the etching surface of an aluminum plate, and an anode lead that is electrically connected to the capacitor anode, wherein the aluminum plate is composed of aluminum of not less than 99.98% by mass, an Fe content of 5 to 50 ppm, with the balance consisting of unavoidable impurities, and has a total content of crystallized or precipitated Fe of 1 to 50% of the original Fe content; the capacitor anode is formed by etching the aluminum plate having a thickness of 0.2 to 1 mm so as to leave a core part having an average thickness of 50 to 150 μm in the central portion in the thickness direction; and the etching is performed over the entirety of the front and back surfaces of the capacitor anode.