NOVELTY - A hydrogen generation device (110) includes sulfur-trap member and soot-trap member provided in at least one of pair of reformers (112, 114) for removing impurities; and control portion for executing a control such that reactant and exothermic material are alternately supplied to each of the pair of reformers, whereby the reforming reaction and the exothermic reaction are alternately carried out in each of the pair of reformers.    USE - The hydrogen generation device is used in fuel cell system (claimed).    ADVANTAGE - Deterioration of the catalyst can be reduced by removing the impurities contained in each material supplied to the reformer. Also, hydrogen-containing gas with few impurities can be supplied to the fuel cell. This reduces the possibility that the performance of the fuel cell deteriorates due to impurities.    DETAILED DESCRIPTION - A hydrogen generation device includes:    (1) a pair of reformers each of which includes a catalyst, and in each of which a reforming reaction is carried out to generate hydrogen-containing gas using reactant on the catalyst, and an exothermic reaction is carried out to heat and recover the catalyst using exothermic material;    (2) sulfur-trap member and soot-trap member provided in at least one of the pair of reformers for removing impurities; and    (3) control portion for executing a control such that the reactant and the exothermic material are alternately supplied to each of the pair of reformers, whereby the reforming reaction and the exothermic reaction are alternately carried out in each of the pair of reformers.    An INDEPENDENT CLAIM is also included for a fuel cell system (100) comprising:    (1) hydrogen generation device; and    (2) fuel cell (120) that generates electric power using the hydrogen-containing gas that is generated by the hydrogen generation device.    DESCRIPTION OF DRAWING(S) - The figure is a schematic diagram showing the configuration of a fuel cell system.    Fuel cell system (100)    Hydrogen generation device (110)    Reformers (112, 114)    Hydrogen membrane fuel cell (120)