Heat storage material container

The “heat storage material storage container” comprises “a main body having a longitudinal direction and including a plurality of flow channels therein, the flow channels extending parallel to each other in the longitudinal direction and separated from each other by porous walls” and “a heat storage material contained in only one or some of the plurality of flow channels.” The plurality of flow channels include “a plurality of first flow channels each having an open end on a first side in the longitudinal direction and a closed end on a second side in the longitudinal direction” and “a plurality of second flow channels each having open ends on both the first side and the second side in the longitudinal direction.” The heat storage material is contained in only the first flow channels.