NOVELTY - A hydrogen generating apparatus (100) comprises 1st normal temperature desulfurizer (11) from which sulfur compound in raw material is removed at normal temperature, hydrodesulfurization device (12) which removes sulfur compound in raw material at a temperature higher than the normal temperature, hydrogen generator (13) which produces hydrogen-containing gas using raw material, feed rate regulator which adjusts supply amount of raw material in 1st normal temperature desulfurizer and hydrodesulfurization device, and controller (20) which controls feed rate regulator.    USE - A hydrogen generating apparatus for fuel cell system (claimed).    ADVANTAGE - Decline in energy efficiency and protraction of starting time are relieved.    DETAILED DESCRIPTION - A hydrogen generating apparatus (100) comprises 1st normal temperature desulfurizer (11) from which sulfur compound in raw material is removed at normal temperature, hydrodesulfurization device (12) which removes sulfur compound in raw material at a temperature higher than the normal temperature, hydrogen generator (13) which produces hydrogen-containing gas using raw material, feed rate regulator which adjusts supply amount of raw material in 1st normal temperature desulfurizer and hydrodesulfurization device, and controller (20) which controls feed rate regulator to give priority to 1st normal temperature desulfurizer over hydrodesulfurization device. The 1st normal temperature desulfurizer and hydrodesulfurization device are used for the removal of sulfur compound in raw material when supplying hydrogen-containing gas to hydrogen utilization apparatus (101) from hydrogen generator. INDEPENDENT CLAIMS are included for:    (1) fuel cell system provided with fuel cell generated using hydrogen-containing gas supplied from hydrogen generating apparatus; and    (2) operating method of hydrogen generating apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the hydrogen generating apparatus. (Drawing includes non-English language text).    1st normal temperature desulfurizer (11)    Hydrodesulfurization device (12)    Hydrogen generator (13)    Controller (20)    Hydrogen generating apparatus (100)