NOVELTY - A reforming apparatus (20) comprises evaporation part (26), mixing part (92), reforming part (21), reforming fuel supply pipe (41), and reforming fuel connecting pipe (93). The evaporation part heats reforming water to generate steam. The mixing part mixes reforming fuel with steam. The removing part has reforming catalyst supplied with the reforming fuel mixed with the steam. The reforming part generates reforming gas from supplied reforming fuel and is disposed on the upper side of the mixing part in the gravity direction.    USE - Reforming apparatus for reforming fuel supply method (claimed) for fuel cell system.    ADVANTAGE - The reforming apparatus is highly reliable that reduces the possibility of flow of water into the reforming catalyst as well as the possibility of deterioration of the performance of the desulfurizer caused by water flowing into the reforming fuel line. The apparatus reduces the possibility that the reforming water flows back to the reforming fuel supply pipe beyond the connecting part and flows into the desulfurizer in upstream of the reforming fuel supply pipe. The possibility of damage to desulfurizing material caused by water can be reduced, improves the reliability of the apparatus. The risk of deterioration caused by water can be lowered, and increases the degree of freedom for disposing the desulfurizer for the removing fuel.    DETAILED DESCRIPTION - A reforming apparatus (20) comprises evaporation part (26), mixing part (92), reforming part (21), reforming fuel supply pipe (41), and reforming fuel connecting pipe (93). The evaporation part heats reforming water to generate steam. The mixing part mixes reforming fuel with steam. The removing part has reforming catalyst supplied with the reforming fuel mixed with the steam. The reforming part generates reforming gas from supplied reforming fuel and is disposed on the upper side of the mixing part in the gravity direction. The reforming fuel supply pipe has desulfurizer for removing a sulfur content of reforming fuel. The reforming fuel connecting pipe is connected at one end to the reforming fuel supply pipe and is opened at the other end to the mixing part. A connecting part between the reforming fuel supply pipe and reforming fuel connecting pipe is above the mixing part in the gravity direction. An INDEPENDENT CLAIM is included for reforming fuel supply method.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the fuel cell system.    Reforming apparatus (20)    Reforming part (21)    Evaporation part (26)    Reforming fuel supply pipe (41)    Mixing part (92)    Reforming fuel connecting pipe (93)