In a stacked solid electrolytic capacitor or a stacked transmission line element, anode portions of adjacent elements are electrically and mechanically connected to each other by the use of connecting members each in the form of a conductive adhesive or solderable metal, via metal plates connected to the anode portions so as to sandwich therebetween the anode portions, respectively, from the upper and lower surfaces thereof. On the other hand, cathode portions of the adjacent elements are electrically and mechanically connected to each other by a conductive adhesive, or are electrically and mechanically connected to each other by the use of adhesive insulating sheets each having a hollowed portion and a conductive adhesive filled in the hollowed portions, or are adhered to each other by adhesive insulating sheets, then electrically connected to each other by a conductive adhesive applied onto side surfaces of the cathode portions.