COLD STORAGE MATERIAL PARTICLES, COLD STORAGE DEVICE, REFRIGERATING MACHINE, CRYOPUMP, SUPERCOND

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Cold storage material particles according to one embodiment of the present invention contain : at least one first element that is selected from the group consisting of rare earth elements, silver (Ag) and copper (Cu); and a second element that is different from the first element and forms a polyvalent metal ion in an aqueous solution. With respect to the cold storage material particles, the atomic concentration of the second element is from 0.001% by atom to 60% by atom; and the maximum value of the volumetric specific heat at a temperature of 20 K or less is 0.3 J/cm3·K or more.