CLADDING FOR POWER STORAGE DEVICE AND POWER STORAGE DEVICE IN WHICH SAME IS USED

A power storage device packaging material according to the present disclosure includes: a laminate at least including a substrate layer, a barrier layer, and a sealant layer, which are disposed in this order; and an adhesive layer interposed between the substrate layer and the barrier layer, the adhesive layer containing a polyurethane-based compound made of a reaction product of at least one polyester polyol resin and at least one polyfunctional isocyanate compound, wherein the polyfunctional isocyanate compound contains an isocyanurate of isophorone diisocyanate, and a content of isocyanate groups derived from the isocyanurate of isophorone diisocyanate in the polyfunctional isocyanate compound is 5 mol% to 100 mol% relative to a total amount of isocyanate groups contained in the polyfunctional isocyanate compound of 100 mol%.