POWER STORAGE DEVICE AND METHOD OF MANUFACTURING SAME

In a power storage device, a welding portion (800) at which a first conductive member (420) and a second conductive member (440) are welded is formed, an outer peripheral edge of a base portion (470A) includes a first portion (471) located in a vicinity of the welding portion (800) and a second portion (472) other than the first portion (471), and the outer peripheral wall is not formed in the first portion (471), or a maximum value of a height of the outer peripheral wall in the first portion (471) is lower than a maximum value of a height of an outer peripheral wall (472A, 473B) in the second portion (472).