POWER STORAGE DEVICE AND METHOD OF MANUFACTURING SAME

In forming a joining portion, vibration is applied in a state in which a first protuberance and a first region face each other with a first electrode tab group being interposed between the first protuberance and the first region, the first protuberance is in abutment with the first outer surface of the first electrode tab group, and the first region and the plurality of second protuberances are in abutment with the second outer surface of the first electrode tab group.