The invention relates to an outer packaging material for a power storage device, and the power storage device. The outer packaging material for the power storage device comprises a polyamide layer (2)as an outer layer, a meltable resin layer (3) as an inner layer, and a metal foil layer (4) configured between the two layers, wherein the polyamide layer is formed in a manner when an initial temperature which is introduced from a melting heat distribution curve that is obtained through differential scanning calorimetry is set to Y (DEG C) and the melting point of the polyamide which is introduced from the melting heat distribution curve is set to X (DEG C), the polyamide satisfies relationships of X-Y<=3.0 and X>=218. By means of the structure, the outer packaging material for the power storage device can be supplied, wherein the outer packaging material can suppress adhesion of the polyamide as the outer layer of the outer packaging material to a sealing rod and can improve productivity.