A packaging material (1) for a power storage device of the present invention includes: a base layer (11) having a first surface and a second surface, the first surface having at least a first adhesive layer (12), a metal foil layer (13), an anticorrosive treatment layer (14), a second adhesive layer (15), and a sealant layer (16) laminated thereon in this order; and a base protective layer (17) laminated on the second surface of the base layer, and formed containing at least one base resin selected from a group consisting of a polyester polyol and an acrylic polyol, each of which has a group having a hydroxyl group on a side chain, and a curing agent containing at least one of a biuret type and an isocyanurate type of isocyanate.