Reformed Gas Production Method and Reformed Gas Production Apparatus The present invention relates to a method for operating a reformed gas production apparatus with which high reforming efficiency can be obtained while preventing catalyst downtime. due to carbon deposition. The reformed gas production method utilizes a reforming catalyst to reform a hydrocarbon-containing fuel having at least two carbon atoms to produce a reformed gas that includes methane, hydrogen and carbon monoxide. With this method, a fluid that includes the fuel, at least one vapor and a carbon dioxide-containing gas, and an oxygen-containing gas, is fed to a reformation reaction region, and with the decomposition index temperature. fuel temperature, which is determined by the type and concentration of hydrocarbons having at least two carbon atoms which make up the fuel, functioning as the upper limit temperature of the reformation reaction region, the fluid is brought into contact with the catalyst of reform to produce the reformed gas.
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