To provide a catalyst having improved durability, and its manufacturing method.

The catalyst includes platinum and a modified inorganic substance carried on an oxide base material. The modified inorganic substance is carried so as to suppress sintering of platinum. A manufacturing method of the catalyst having platinum and the modified inorganic substance carried on the oxide base material so as to suppress sintering of platinum comprises the steps of impregnating a dispersion containing a precursor of the modified inorganic substance to the oxide base material having platinum carried thereon, drying and calcining it.