A packaging material 10 for a power storage device includes a structure made up of a cover layer 21, a barrier layer 22, a sealant adhesive layer 16, and a sealant layer 17 laminated in this order. In the packaging material, the barrier layer 22 has an aluminum foil layer 14 and an anticorrosion treatment layer 15b that is provided to a sealant layer 17 side surface of the aluminum foil layer 14 and faces the sealant adhesive layer 16. The sealant layer 17 side surface of the aluminum foil layer 14 has a 60° glossiness that is 690 or less in both MD and TD, and has a difference in 60° glossiness between MD and TD that is 100 or less.