An object of the present invention is to provide a metal-supported catalyst that has high catalytic activity and selectivity and can be handled in air. The present invention contains Ru and Sn, the half width of the peak at 2θ = 43 ° of powder X-ray diffraction analysis is 3.61 ° or less, and the oxidation rate represented by [X / Y] × 100 is 38%. The present invention relates to the above metal-supported catalyst. X represents the number of moles of oxygen required to oxidize the metal-supported catalyst when the metal-supported catalyst is subjected to temperature reduction and then oxidized at room temperature, and Y is supported on the metal-supported catalyst. Represents the total number of moles of metal formed.
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