RARE EARTH OXYSULFIDE COLD STORAGE MEDIUM

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Provided is a cold storage medium having a large heat capacity in an extremely low temperature region of 10 K or less, and having excellent durability against thermal shock or mechanical vibration. Al2O3 having a specific surface area of 0.3-11 m2/g is added to this cold storage medium made using rare earth oxysulfide ceramics represented by general formula R2O2S (R represents one kind, or two or more kinds of rare earth elements selected from among La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, as well as Y).