Abstract: A multi-layered solid electrolytic capacitor and a method of manufacturing the capacitor that improve the product yield drastically by preventing increases in leakage current and defects due to short circuits without increasing manufacturing cost or capacitor size. A multi-layered solid electrolytic capacitor includes: a plurality of capacitor elements, each including an aluminum foil having an anode portion and a cathode portion having a dielectric oxide film and a cathode layer formed in succession on a surface of the aluminum foil, wherein the plurality of capacitor elements are stacked on top of one another, the anode portions of adjacent capacitor elements are welded each other, and the anode portion of one of the outermost capacitor elements is weld-secured to an anode terminal, the multi-layered solid electrolytic capacitor having a first stress alleviating groove and a second stress alleviating groove formed in at least one of weld surfaces of the anode portion.

Abstract: [Problem] A multi-layered solid electrolytic capacitor and a method of manufacturing the capacitor are provided that make it possible to improve the product yield drastically by preventing increases in leakage current and defects due to short circuits without increasing manufacturing cost or capacitor size.

Abstract: [Problem] A multi-layered solid electrolytic capacitor and a method of manufacturing the capacitor are provided that achieve an improved production yield as well as improved welding strength and product reliability by preventing sparks and welding burrs that develop during resistance welding. [Means for Solving the Problem] A multi-layered solid electrolytic capacitor (10) includes a plurality of capacitor elements (6), each comprising a dielectric oxide film (2) formed on a surface of a valve metal, a main body part (8) having a cathode layer formed on a portion of the surface of the dielectric oxide film (2), and an anode lead part (7) in which the dielectric oxide film (2) is exposed, wherein the capacitor elements are in a stacked condition and the anode lead parts (7) of adjacent ones of the capacitor elements (6) are weld-secured to one another.