Inside of a first absorption chamber of a canister, a heat storage material container in which a heat storage material constituted of a material that is larger in thermal conductivity and higher in heat capacity than an absorber is accommodated is provided. Since the heat storage material is isolated from the absorber, a larger contact area of the absorber with vaporized fuel gas and air can be secured, and thereby the absorption capacity and desorption capacity of the absorber can be highly exerted. Accordingly, the heat storage material can inhibit the absorber from varying in temperature, the absorber can be prevented from deteriorating in absorption capacity, and the heat storage material can be prevented from deteriorating.