NOVELTY - A hydrogen-containing gas generator comprises a modifying portion (3), a transformation portion (4), combustion-type heater (17), modification water supply unit (J) and operation-controlling unit (C). The modifying portion generates reforming process gas by performing reformation process of raw material having hydrogen gas as main component, and hydrocarbon-type mineral fuel. The transformation portion performs conversion process of carbon monoxide gas-contained in reforming process gas into carbon dioxide gas, and cooled in heat exchanger for recovering heat.    USE - Hydrogen-containing gas generator is used for producing fuel gas used in power generation reaction of fuel cell.    ADVANTAGE - The hydrogen-containing gas generator has improved stability, and efficiently supplies hydrogen-containing gas with reduced concentration of carbon monoxide.    DETAILED DESCRIPTION - A hydrogen-containing gas generator comprises a modifying portion, a transformation portion, combustion-type heater, modification water supply unit and operation-controlling unit. The modifying portion generates reforming process gas by performing reformation process of raw material having hydrogen gas as main component, and hydrocarbon-type mineral fuel. The transformation portion performs conversion process of carbon monoxide gas-contained in reforming process gas into carbon dioxide gas, and cooled in heat exchanger for recovering heat. The combustion-type heater provides modifying processing heat to modifying portion, and transformation processing heat to transformation portion. The modification water-supply unit supplies water for modification process of raw material and mineral fuel in modification portion. The operation-control unit controls the driving operation of various components in gas generating apparatus. When the temperature of transformation portion becomes higher than the appropriate setting temperature of transformation process, then the operation-control unit controls the operation of heating unit such that the temperature of modification portion becomes appropriate setting temperature. When the adjustment of water supply feed rate is increased, the ratio of quantity of water vapor with respect to raw material and mineral fuel is increased, and then the operation of modification water supply is controlled.    DESCRIPTION OF DRAWING(S) - The drawing shows the longitudinal cross-sectional view of hydrogen-containing gas generator. (Drawing includes non-English language text)    Desulfurization portion (1)    Modification portion (2)    Transformation portion (4)    Combustion-type heater (17)    Operation-control unit (C)    Modification water supply unit (J)