There is provided an electrochemical capacitor including a lid; a case having a via, and forming a liquid chamber together with the lid; an electric storage element housed in the liquid chamber; an electrolyte housed in the liquid chamber; a wiring having a via part arranged within the via, and connecting an inside to an outside of the liquid chamber; an extraction electrode connected to the via part; an overcoating layer for coating the extraction electrode, and having an opening to expose a partial region of the extraction electrode; and a conductive adhesive layer for fixing the electric storage element to the overcoating layer, and electrically connecting the electric storage element to the extraction electrode through the opening.