Disclosed is an adhesive sheet 1 for use in a battery, the adhesive sheet 1 comprising: a base material 11; a hard coat layer 12 provided on one surface side of the base material 11; and an adhesive agent layer 13 provided on a surface of the hard coat layer 12 on the opposite side from the base material 11. With this adhesive sheet 1, it is possible to favorably maintain adhesive force and prevent peeling from an adherend, even when in contact with an electrolytic solution.