Abstract

The invention provides a capacitor element and solid electrolyte capacitor which allow significant increase in electrostatic capacity with the same dimensions and shape, as well as a process for their production. The capacitor element 12 of the invention is provided with an aluminum base 18 having a shape with a plurality of sides 1a, 1b, anode sections 30 partially formed at the edge region 3a, 3b of at least one side among the plurality of sides in the area on the main surface 12b of the aluminum base 18, cathode sections 32 comprising a solid electrolyte layer 22 formed on the aluminum base 18 via an aluminum oxide film 20 and a silver paste layer 26 formed on the solid electrolyte layer 22, which are formed on the remaining regions 31 from the regions on which the anode sections 30 are formed, in the area on the main surface 12b of the aluminum base 18, and slits 28 which provide electrical insulation between the anode sections 30 and cathode sections 32. As a result, the anode sections 30 are positioned inward from the outer perimeter 52 of the aluminum base 18 on which the cathode sections 32 are formed, and therefore the area of the capacitor element 12 may be increased to approach the area of the external dimensions of the capacitor 10 fabricated using the capacitor element 12.