NOVELTY - Hydrogen production comprises supplying raw material gas and steam to reactor (1) filled with reforming catalyst (10) and carbon dioxide gas absorbent (11) containing lithium composite oxide (i.e. lithium silicate) at a ratio of absorbent/catalyst by volume not less than 9 and lower than 17, preferably 11-13; and heating inside of reactor at 450-570, preferably 500-550degreesC, carrying out reforming reaction. The reforming catalyst has a structure where catalyst metal particle of nickel, ruthenium, rhodium, palladium, platinum, and/or cobalt is supported on carrier from e.g. alumina.    USE - For producing hydrogen used as fuel to a fuel cell i.e. solid polymer type fuel cell.    ADVANTAGE - Efficient hydrogen production and decrease of the concentrations of carbon monoxide and carbon dioxide produced as byproducts can be lowered. The method obtains a product gas with greater than or equal to 70, preferably greater than or equal to 80% hydrogen concentration and less than or equal to 0.5% concentration of both of carbon monoxide and carbon dioxide and with no need of treatment in a carbon monoxide conversion apparatus. Compared with a conventional methanation reaction of the product gas containing hydrogen, carbon monoxide and carbon dioxide (particularly, the carbon dioxide concentration is high), hydrogen consumption can be saved corresponding to the low degree of carbon dioxide. Thus, carbon monoxide can be decreased to less than or equal to 10 ppm. The product gas can be used efficiently for cell fuel.    DETAILED DESCRIPTION - Hydrogen production comprises supplying raw material gas and steam to reactor filled with reforming catalyst and carbon dioxide gas absorbent containing lithium composite oxide (i.e. lithium silicate) at a ratio of absorbent/catalyst by volume not less than 9 and lower than 17, preferably 11-13; and heating inside of reactor at 450-570, preferably 500-550degreesC, carrying out reforming reaction. The reforming catalyst has a structure where catalyst metal particle of nickel, ruthenium, rhodium, palladium, platinum, and/or cobalt is supported on carrier from alumina, magnesia, ceria, lanthanum oxide, zirconia, silica, or titania.    DESCRIPTION OF DRAWING(S) - The figure is a partial cross-sectional view showing a hydrogen producing apparatus.    Reactor (1)    Flanges (2a, 2b)    Reforming catalyst (10)    Carbon dioxide gas absorbent (11)