NOVELTY - Hydrogen-containing gas production apparatus (10) comprises a pump (P2) causing gas to flow through circulation path (C) containing reforming device (3), carbon monoxide shift converter (4), and carbon monoxide removal device (5), for reduction process of carbon monoxide conversion catalyst (4a) and carbon monoxide removal catalyst (5a) ; and water-content removal mechanism (D) where water vapor in the gas for reduction processing is condensed by a condenser, which is provided at the location just before the carbon monoxide removal device in the circulation path.    USE - For producing hydrogen-containing gas as fuel gas for electric power generation reaction in a fuel cell.    ADVANTAGE - The apparatus produces hydrogen-containing-gas with very small carbon monoxide content at low cost. Adhesion of water to the surface of the carbon monoxide removal catalyst is prevented. Thus, activity of catalyst can be prevented from falling so that the surface area of the carbon monoxide removal catalyst is not reduced.    DETAILED DESCRIPTION - Hydrogen-containing gas production apparatus comprises a reforming device for reforming processing of an original fuel and produces the hydrogen-containing-gas; a carbon monoxide shift converter, which carries out transformation processing of carbon monoxide contained in hydrogen-containing gas into carbon dioxide, by carbon-monoxide-conversion catalyst; carbon monoxide removal device for selectively oxidizing carbon monoxide contained in hydrogen-containing-gas, by carbon monoxide removal catalyst, after the transformation process; a pump causing the gas to flow through circulation path containing the reforming device, carbon monoxide shift converter, and carbon monoxide removal device, for reduction process of carbon monoxide conversion catalyst and carbon monoxide removal catalyst; water-content removal mechanism where water vapor in the gas for reduction processing is condensed by a condenser, which is provided at the location just before the carbon monoxide removal device in the circulation path; and a separator for isolating the condensed water in the gas for reduction process.    DESCRIPTION OF DRAWING(S) - The figure is a functional block diagram showing the gas reduction process in hydrogen-containing gas production apparatus. (Drawing includes non-English language text)    Reforming device (3)    Carbon monoxide shift converter (4)    Carbon monoxide conversion catalyst (4a)    Carbon monoxide removal device (5)    Carbon monoxide removal catalyst (5a)    Hydrogen-containing gas production apparatus (10)    Circulation path (C)    Water-content removal mechanism (D)    Pump (P2)