To reduce manufacturing cost of a resin made case in a heat accumulation type cooler to cool a nap room, or the like of a truck by a heat accumulating material.

A heat accumulation type cooler is furnished with a heat accumulating pack 23 storing a heat accumulating material, an evaporator 10 for heat accumulation to cool this heat accumulating pack 23 and an air blower in a resin made case, and it is constituted to blow out cold air cooled by the heat accumulating pack 23 to a cooling objective portion of a nap room, or the like of a truck by the air blower. In this case, this case is constituted of a frame shape main body case 162 storing and supporting the heat accumulating pack 23, the evaporator 10 for heat accumulation and the air blower, a front surface case 160 to block a front surface opening side of this main body case 162 and a rear surface case 161 to block a rear surface opening side of the main body case 162.