In order to solve the problem of the generation of the interspace between layers, the present invention provides an actuator including: a conductive polymer layer; an ambient temperature molten salt layer; and an opposite electrode layer; wherein the ambient temperature molten salt layer is interposed between the conductive polymer layer and the opposite electrode layer, the ambient temperature molten salt layer includes an adhesive layer in the inside thereof; one surface of the adhesive layer adheres to the conductive polymer layer; and the other surface of the adhesive layer adheres to the opposite electrode layer.