NOVELTY - A hydrogen generating apparatus (1) comprises desulfurizer (2) which reduces concentration of sulfur compound contained in source gas, reforming reactor (3) which reforms source gas emitted from desulfurizer and generates hydrogen-containing-gas, source gas path (7) which supplies source gas to desulfurizer, exhaust gas path (8) which emits hydrogen-containing-gas, recycle gas path (10) which branches in a part of hydrogen-containing-gas from 1st branch part in middle of exhaust gas path and supplies to desulfurizer, and condensed water path (13) which emits condensed water.    USE - A hydrogen generating apparatus for fuel cell system (claimed).    ADVANTAGE - Back flow of condensed water after shutdown of hydrogen generating apparatus is prevented. Performance degradation of desulfurizing agent or catalyst of hydrogen generator is suppressed.    DETAILED DESCRIPTION - A hydrogen generating apparatus (1) comprises desulfurizer (2) which reduces concentration of sulfur compound contained in source gas, reforming reactor (3) which reforms source gas emitted from desulfurizer and generates hydrogen-containing-gas, source gas path (7) which supplies source gas to desulfurizer, exhaust gas path (8) which emits hydrogen-containing-gas, recycle gas path (10) which branches in a part of hydrogen-containing-gas from 1st branch part in middle of exhaust gas path and supplies to desulfurizer, condensed water path (13) which emits condensed water connected to 2nd branch part in the middle of recycle gas path and connection part of condensed water tank and condenses water vapor in recycle gas path, source gas valve which is provided on source gas path and communicates/blocks source gas, exhaust gas valve which is provided downstream than 1st branch part of exhaust gas path, 1st valve which is provided after 2nd branch part of recycle gas path or downstream of merging part with recycle gas path of source gas path, and 2nd valve which is provided in the part of upstream from the part of upstream or 1st branch part of exhaust gas path. The upper limit position of water level of condensed water is preset inside so that condensed water tank may prevent water level rise to 2nd branch part. Lowest-part of condensed water path is arranged in position below upper limit position and 2nd branch part is arranged in position higher than upper limit position of condensed water tank. An INDEPENDENT CLAIM is included for a fuel cell system.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the hydrogen generating apparatus. (Drawing includes non-English language text).    Hydrogen generating apparatus (1)    Desulfurizer (2)    Reforming reactor (3)    Source gas path (7)    Exhaust gas path (8)    Recycle gas path (10)    Condensed water path (13)