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A cooler box includes a box member that has a hermetically closable cooling chamber formed inside it and that insulates heat and a cooling device that cools the interior of the cooling chamber. The cooling device is a Stirling-cycle refrigerator. Here, using a Stirling-cycle refrigerator as the cool

A cooler box includes a box member that has a hermetically closable cooling chamber formed inside it and that insulates heat and a cooling device that cools the interior of the cooling chamber. The cooling device is a Stirling-cycle refrigerator. Here, using a Stirling-cycle refrigerator as the cooling device helps realize a cooler box that can be operated from an easily available low-capacity, inexpensive power supply and that can cool a to-be-cooled article to a low temperature comparable with that produced by a freezer.

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1. A cooler box including a heat insulating box member having an interior thereof divided into a machine chamber and a cooling chamber, the cooler box cooling food or drink placed inside the cooling chamber by introducing cold, produced by driving a Stirling-cycle refrigerator disposed inside the ma

1. A cooler box including a heat insulating box member having an interior thereof divided into a machine chamber and a cooling chamber, the cooler box cooling food or drink placed inside the cooling chamber by introducing cold, produced by driving a Stirling-cycle refrigerator disposed inside the machine chamber, into the cooling chamber through a cooling element, wherein the Stirling-cycle refrigerator is of a free-piston type that has a displacer reciprocating inside a cylinder filled with a working gas, and the cooler box further comprises: means for removing frost covering the cooling element, the means for removing frost being waste heat conducting means for conducting heat radiated from a heat rejecting portion of the Stirling-cycle refrigerator to the cooling element, the waste heat conducting means comprising: a first conduit for circulating a fluid between the heat rejecting portion of the Stirling-cycle refrigerator and a heat exchanger disposed away from the heat rejecting portion; a second conduit for circulating the fluid between a heat absorbing portion of the Stirling-cycle refrigerator and the cooling element disposed away from the heat absorbing portion; and flow path switching means located at where the first and second conduits cross each other to permit the first and second conduits to communicate with each other so as to form a single closed circuit. 2. A cooler box including a heat insulating box member having an interior thereof divided into a machine chamber and a cooling chamber, the cooler box cooling food or drink placed inside the cooling chamber by introducing cold, produced by driving a Stirling-cycle refrigerator disposed inside the machine chamber, into the cooling chamber through a cooling element, wherein the Stirling-cycle refrigerator is of a free-piston type that has a displacer reciprocating inside a cylinder filled with a working gas, and the cooler box further comprises: means for removing frost covering the cooling element, and the machine chamber has an interior thereof divided by a partition wall into a cooling side where the cooling element is disposed and a heat rejecting side where the heat rejecting portion of the Stirling-cycle refrigerator is disposed, the frost removing means comprising: a first valve for opening and closing an opening through which the cooling side of the machine chamber and the cooling chamber communicate with each other; and a second valve for opening and closing one of an opening formed in part of the partition wall or an opening formed between the heat rejecting side of the machine chamber and an interior space. 3. A cooler box including a heat insulating box member having an interior thereof divided into a machine chamber and a cooling chamber, the cooler box cooling food or drink placed inside the cooling chamber by introducing cold, produced by driving a Stirling-cycle refrigerator disposed inside the machine chamber, into the cooling chamber, wherein the Stirling-cycle refrigerator is of a free-piston type that has a displacer reciprocating inside a cylinder filled with a working gas, and the cooler box further comprises: cold storing means for storing the cold disposed inside the cooling chamber, the cold storing means being a sheet-shaped cold storing member laid along part or all of bottom and side surfaces of the cooling chamber, the cold storing member detachably laid in the cooler box, so that it can be readily removed.