A surface of an anode body made of a metal material having a valve action is oxidized so as to form a dielectric layer, a conductive polymer precursor solution is stuck to the surface of the dielectric layer, the solvent is evaporated in an atmosphere of a relative humidity of 30 to 45% to be removed, electropolymerization is carried out so as to obtain a semiconductor layer having projections being 2 to 70 μm high on the outer surface thereof, a conductive carbon layer is laminated using a conductive carbon paste, and a conductive metal layer containing a metal conductive powder and a binder is laminated so as to obtain an element for an electronic component, and the element for an electronic component is encapsulated by a resin so as to obtain an electronic component.