And a cold accumulating type refrigerator using the same

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A regenerator comprises a regenerator body and cold accumulating material packed in the regenerator body in which cooling medium gas flows from one end portion of the regenerator body to the other end portion of the regenerator body so as to obtain a lower temperature, wherein at least part of the cold accumulating material is a plate-shaped cold accumulating material having a thickness of 0.03-2 mm. In the above structure, it is preferable that the cold accumulating material is composed of an alloy containing 10 at % or more of rare earth element and that a length of the plate-shaped cold accumulating material in a flowing direction of the cooling medium gas is 1-100 mm. According to the above structure, there can be provided a regenerator (cold accumulating unit) and a refrigerator using the regenerator which is free from being finely pulverized, and is excellent in workability and durability, and capable of exhibiting a significant refrigerating performance at low temperature range for a long period of time in a stable condition.