Abstract: A stator including, a stator core having a slot, a winding wire to be inserted into the slot; and an insulation sheet interposed between the slot and the winding wire and configured to electrically insulate an inner wall of the slot and the winding wire, wherein the insulation sheet includes an insulation paper, a first adhesive layer disposed on a front surface of the insulation paper facing the inner wall of the slot, and a second adhesive layer disposed on a back surface of the insulation paper facing the winding wire, a foaming adhesive to be thermally cured while foaming by heating is disposed on the first adhesive layer, and a non-foaming adhesive having lower viscosity than that of the foaming adhesive when unheated is disposed on the second adhesive layer.