NOVELTY - A hydrogen generating apparatus (1) comprises hydrogen generator (2) which produces fuel gas which contains hydrogen and modifies source gas containing hydrocarbon, combustor (5) which burns fuel gas and heats hydrogen generator, ignition device (9), combustion detector (10) which detects combustion of combustor, source gas path (3) for connecting to hydrogen generator and supplying source gas to hydrogen generator, source gas supply device which is arranged on source gas path and supplies source gas to hydrogen generator, and combustion path (6) which supplies fuel gas to combustor.    USE - A hydrogen generating apparatus (claimed).    ADVANTAGE - The hydrogen generating apparatus can judge whether the source gas flow volume supplied by the source gas supply device is normal, even without a flowmeter.    DETAILED DESCRIPTION - A hydrogen generating apparatus (1) comprises hydrogen generator (2) which produces fuel gas which contains hydrogen and modifies source gas containing hydrocarbon, combustor (5) which burns fuel gas and heats hydrogen generator, ignition device (9), combustion detector (10) which detects combustion of combustor, source gas path (3) for connecting to hydrogen generator and supplying source gas to hydrogen generator, source gas supply device which is arranged on source gas path and supplies source gas to hydrogen generator, combustion path (6) which supplies fuel gas to combustor from hydrogen generator, on-off valve which is arranged at source gas path or combustion path and opens when pressure of gas applied upstream is more than a predetermined value, air supply device (8) which supplies air to combustor, and controller which operates source gas supply device with a predetermined operating quantity when source gas supplied from source gas supply device has pressure higher than a predetermined pressure, and on-off valve is opened to supply source gas upstream and operates ignition device and air supply device when combustion is detected in combustion detector inside for 1st predetermined time and determines that the source gas supply device is operating normally, and the on-off valve is closed.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the hydrogen generating apparatus. (Drawing includes non-English language text).    Hydrogen generating apparatus (1)    Hydrogen generator (2)    Source gas path (3)    Combustor (5)    Combustion path (6)    Air supply device (8)    Ignition device (9)    Combustion detector (10)