Hydrocarbon gas reforming catalyst, a manufacturing method of their preparation and synthesis gas

While suppressing the carbon deposition, carbon dioxide hydrocarbon feedstock gas, water vapor, is reacted oxygen such as, efficiently and hydrocarbon-based gas reforming catalyst to produce carbon monoxide, a method of manufacturing the same, and manufacturing to provide a method of manufacturing a synthesis gas with a hydrocarbon-based gas reforming catalyst. A raw material containing Sr, and a raw material containing Ti and / or Zr, and heat-treated in the presence of NiO, Ni-SrTiO The SrCO The above-mentioned hydrocarbon gas reforming catalyst, and reduction treatment to obtain a metallic Ni, the reduction treated catalyst containing as the main component and SrTiO