COOLING STORAGE MATERIAL AND METHOD FOR PRODUCING SAME, COOLING STORAGE DEVICE, AND REFRIGERATING

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Provided are : a cooling storage material of which the filling rate can be improved and falls within a proper range, and which can facilitate the reduction in pressure loss of a refrigerant gas in a cooling storage device; and a method for producing the cooling storage material. The cooling storage material according to the present invention comprises a sintered product of grains each containing a rare earth element, wherein the porosity of the sintered product is 30 to 40%. The method for producing a cooling storage material according to the present invention comprises a step of sintering raw material grains each containing a rare earth element, wherein the raw material grains have a D50 value of 100 to 320 μm and a D90/D10 ratio of 1.5 to 2.5 (wherein the terms "D10", "D50" and "D90" respectively represent average grain diameters corresponding to 10%, 50% and 90% in the total number of the grains in a grain size distribution curve).