Heat resistant oxide

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Provided is a heat-resistant oxide exhibiting excellent oxygen storage capacity under a high temperature oxidation-reduction fluctuating atmosphere regardless of reduction of its specific surface area, and this heat-resistant oxide is expressed in the following general formula : Ce1-(x+y)ZrxRyO2-zwhere R represents a rare earth metal, z represents an oxygen deficiency, x represents an atomic ratio of 0.15 to 0.70, y represents an atomic ratio of 0.05 to 0.25, and x+y represents a range of 0.20 to 0.95 respectively.