To provide a reforming catalyst reducing nitrogen oxide and particulate substance by improving burning efficiency of a fuel oil.

The reforming catalyst for reducing the nitrogen oxide and the particulate substance of the fuel oil is a burned molded body formed by silver-substituted zeolite for emitting a silver ion; and a quartz porphyry powder containing K-40 for emitting β ray. The emission intensity of the silver ion of the silver-substituted zeolite is 10-100 ppb and the irradiation intensity of the β ray of the quartz porphyry powder is 1-5 Bq/g.