A capacitor includes a base having a hollow or open portion in an upper surface for containing a battery element or an electric double layer capacitor element and an electrolytic solution in an inside thereof, a metallized layer formed to a periphery of the base defining the hollow or open portion in the upper surface and a frame member made of metal brazed to the metallized layer so as to surround the hollow or open portion. An inner lateral surface of the frame member is inclined outward, and a corrosion resistant layer is deposited so as to continuously cover the inclined surface and a portion of the surface of the metallized layer situated inward thereof.