POWER STORAGE DEVICE

In a power storage device (1), a plurality of electrode tabs (32A) includes a bent portion (34A, 35A) bent in a tab thickness direction (TH). At least one of the electrode tabs (32A) constituting an electrode tab group (38A) has a shape that a tab width (L2) of a connection-side bent portion (34A) of bent portions (34A, 35A), which is located on a side close to a tab connection portion (33A), is smaller than a tab width (L1) of a tab connection portion (33A) including a bonded portion (33Ay) located on an inside (WH1) in a tab width direction, the bonded portion (33Ay) being bonded to an electrode terminal (50) directly or through another or other electrode tabs (32A) (L2