POWER STORAGE DEVICE

In a power storage device, a plurality of electrode tabs includes a bent portion bent in a tab thickness direction. At least one of the electrode tabs constituting an electrode tab group has a shape that a tab width of a connection-side bent portion of bent portions, which is located on a side close to a tab connection portion, is smaller than a tab width of a tab connection portion including a bonded portion located on an inside in a tab width direction, the bonded portion being bonded to an electrode terminal directly or through another or other electrode tabs.