A cold accumulating material, its manufacturing method and a cold accumulation type refrigerating m

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PROBLEM TO BE SOLVED : To provide a cold storage material capable of stably exhibiting remarkable freezing ability over a long period in a cryogenic area and to provide a cold storage type refrigerator, etc., by using the cold storage material. SOLUTION : The cold storage material is composed of a rare earth acid sulfide in which minimum value of reflectance obtained when irradiated with rays having 400-600 nm wavelength is ≥30% and ≤95%. The rare earth acid sulfide is preferably a magnetic material compound represented by general formula (1) : R2O2S (wherein R is at least one kind of rare earth element selected from Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho and Er). COPYRIGHT : (C)2004, JPO&NCIPI