POWER STORAGE DEVICE

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