The invention provides an electric energy storage element, which can inhibit the corrosion between different metals and has a reduced cost. The electric energy storage element (100) comprises a negative terminal (41) taken as a first conductive member; a negative current collection member (44), which is taken as a second conductive member, is electrically connected to an electrode body (20), is connected to the negative terminal (41), penetrates a container (10) as the cover (12) of a wall portion; and a nonmetal sealing member (45) arranged between the negative terminal (41) and the negativecurrent collection member (44). The negative terminal (41) directly contacts with the negative current collection member (44). The negative terminal (41) and the negative current collection member (44) are made of different metals. The sealing member (45) is arranged on the contact interface between the negative current collection member (44).