POWER STORAGE DEVICE

The power storage device (2A) includes an electrode assembly (101), a housing case (20) that houses the electrode assembly (101), and an exhaust valve (21ab) formed on the housing case (20). The housing case (20) includes a first end plate (22), a second end plate (21a), and a peripheral wall (21b) provided between the first end plate (22) and the second end plate (21a). A portion of the peripheral wall (21b) on the side of the second end plate (21a) is thinner than a portion thereof on the side of the first end plate (22). The exhaust valve (21ab) is formed on the second end plate (21a).