HYDROGEN GENERATOR AND FUEL CELL SYSTEM FOR PROVIDED WITH THE SAME

PROBLEM TO BE SOLVED: To provide a hydrogen generator in which the performance deterioration of a hydro-desulfurizer is decreased, and a fuel cell system.SOLUTION: A hydrogen generator includes: a material gas path 10 that supplies a material gas; a hydro-desulfurizer 20 that decreases the concentration of a sulfur compound contained in the material gas supplied from the material gas path by hydrogenation; a reformer 30 that modifies the material gas exhausted from the hydro-desulfurizer and generates a hydrogen-containing gas; a recycle gas path 40 that supplies a part of the hydrogen-containing gas exhausted from the reformer to the material gas path; a heater 60 that heats at least one of the material gas path and the recycle gas path; and a controller 70 that controls a heating amount by the heater so that the temperature of a gas supplied to the hydro-desulfurizer becomes the dew point of the gas or higher.