POWER STORAGE DEVICE

A power storage device includes: an electrode group including first and second electrodes; a case accommodating the electrode group therein, the case having an opening; and a sealing body closing the opening of the case. The sealing body includes: an annular sealing plate having a first surface and a second surface opposite to the first surface, the sealing plate having a first through-hole provided therein; a terminal plate having a third surface and a fourth surface opposite to the third surface, the third surface facing the first surface of the sealing plate; and an annular gasket disposed between the sealing plate and the terminal plate, the gasket having a second through-hole overlapping the first through-hole. The sealing plate includes a first recessed portion and an outer peripheral portion connected to a peripheral edge of the first recessed portion, the first recessed portion having a recess in the first surface of the sealing plate and having the first through-hole therein. The terminal plate includes a projecting portion projecting from the third surface toward the sealing plate and a flange portion extended from the projecting portion in a second direction intersecting with a first direction. The projecting portion has an end surface closing the first and second through-holes. The projecting portion of the terminal plate is accommodated in the first recessed portion. A peripheral edge of the outer peripheral portion of the sealing plate is joined with an opening end portion of the case. The first electrode and the second electrode are electrically connected to the terminal plate and the case, respectively.