Abstract: The fuel reformer, especially for a fuel cell, produces a hydrogen-containing reformate from a fuel or hydrocarbon mixture supplied to it by partial oxidation (POX) and/or an autothermal reforming process. The reformer provides improved local reaction temperatures with increased conversion of hydrocarbons to hydrogen, decreased residual carbon monoxide formation and at the same time an increased yield of hydrogen. A gas supply member for distribution of reactants, such as air and/or oxygen, is arranged within the flow path of the fuel or hydrocarbon mixture in the reformer. The gas supply member has a plurality of gas supply outlets distributed in a flow direction along the fuel flow path for supplying the reactants to a catalyst material, which are distributed and formed so that reaction regions are more uniformly distributed along the flow path.