POWER STORAGE DEVICE

A power storage device 10 includes a first electrode 21 having a first current collector, a second electrode 22 having a second current collector, and a separator 23. The first electrode 21, the second electrode 22, and the separator 23 form a columnar wound body 20. The power storage device 10 further includes a cylinder 32, 61 covering an outer periphery of the columnar wound body 20 and having a first opening 31, a sealing body 40 that seals the first opening 31, and at least one first tab 21a, its one end connected to the first current collector and the other end connected to the sealing body 40. The sealing body 40 has a first member 41 including a first face 41a facing away from the columnar wound body 20, and a second member 42 including a second face 42a facing the columnar wound body 20. The other end of the first tab 21a is welded to the first face 41a of the first member 41 to form a first welding portion 43, and the first welding portion 43 is positioned between the first face 41a and the second face 42a. This allows the internal resistance of the power storage device 10 to decrease.