A packaging material for a power storage device includes a base material layer as an outer layer, a heat fusible resin layer as an inner layer, and a metal foil layer arranged between both the layers. The base material layer and the metal foil layer are adhered via an outer adhesive layer. The outer adhesive layer is formed of a cured film of a two-part curing type urethane adhesive agent including a main agent containing a polyol and a multifunctional isocyanate mixture, wherein a content rate of the polyol is 50 mass % to 95 mass %. The multifunctional isocyanate mixture is composed of a mixture containing an aromatic multifunctional isocyanate and an aliphatic multifunctional isocyanate having an aromatic ring.