POWER STORAGE DEVICE PACKAGING MATERIAL AND POWER STORAGE DEVICE

A power storage device packaging material at least includes a substrate layer, a barrier layer including a metal layer, an adhesive layer, and a sealant layer in this order. The adhesive layer contains a hydrophobic insulating inorganic filler. The content of the hydrophobic insulating inorganic filler in the adhesive layer may be 0.5 to 20 mass %.