Cold storage material, cold storage material particle, granulated particle, cold storage device, refrigerator, cryopump, superconducting magnet, nuclear magnetic resonance imaging apparatus, nuclear magnetic resonance apparatus, magnetic field application type single crystal pulling apparatus, helium re-condensing device, and dilution refrigerator

A cold storage material comprising:

• a rare earth oxysulfide containing at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;
• a garnet-type rare earth oxide containing Al and at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu;
• and
• an aluminum oxide,
• wherein a ratio of X-ray diffraction peak intensity of the garnet-type rare earth oxide to X-ray diffraction peak intensity of the rare earth oxysulfide is 0.1% or more and 40% or less.