A solid electrolytic capacitor is obtained in which a sintered metal serves as
an anode and a silver layer serves as a cathode. A surface of sintered metal made
of tantalum or the like and having an open porosity ratio of more than 75% is oxidized
so that an oxide film made of tantalum pentoxide or the like is deposited thereon.
Cavities of the metal are filled with an electrically conductive material. Then,
the metal is wound around a lead wire and made into a desired shape and size. The
silver layer is formed on this porous metal body. Because a specific surface area
of the sintered metal is large, a large capacity is obtained.