POWER STORAGE DEVICE

PROBLEM TO BE SOLVED: To prevent mis-assembly of a power storage module in a high potential side and in a low potential side when a power storage device is formed by fastening a plurality of power storage modules between a pair of connection plates.SOLUTION: A plurality of storage modules M are disposed between a pair of connection plates 26, and fastening holes 23d respectively arranged in a pair of end plates 14A, 14B are aligned to reference fastening holes 26a respectively arranged in a pair of the connection plates 26, and are fastened by fastening members 29 to constitute a power storage device P. A pair of end plates 14A, 14B comprises: a main plate 22; and a sub plate 23 having the fastening holes 23d. The main plate 22 and sub plate 23 can be coupled in two positional relationships where positions of the fastening holes 23d are different. The high potential side and low potential side end plates 14A, 14B can be respectively formed to be different shapes from each other to prevent mis-assembly of the connection plate 26. The high potential side end plate and the low potential side end plate 14A, 14B are same, and therefore there is no need to manufacture them separately, thereby achieving cost reduction.