An elongate gas distributing tube, which extends in a longitudinal direction of a container, is accommodated within the container that constitutes a gas storage container. Discharge ports, through which the gas is discharged, are provided only on a side circumferential wall of the gas distributing tube. Therefore, the discharged gas advances while being directed toward the inner side wall of the container. The gas distributing tube is surrounded by a gas absorbing/adsorbing material. On the other hand, the gas absorbing/adsorbing material is surrounded by a mixture, which is prepared by mixing the gas absorbing/adsorbing material with a heat storage material, such that heat is absorbed by the heat storage material contained therein.