NOVELTY - A reforming method involves supplying a gas mixture (2) to one end of reforming rooms (6) for reformation and discharging a reformed gas (4) from the other end of the rooms. A catalyst (8a) which catalyzes a partial oxidation reaction in an oxygen environment is loaded into the upstream end of the rooms (6). A catalyst (8b) for reforming is charged into the downstream portion of the rooms.    USE - For reforming a hydrocarbon-based fuel like alcohol (e.g. methanol) into a fuel gas containing hydrogen, for industries which use high-purity hydrogen as a fuel, such as for fuel cells.    ADVANTAGE - The reforming rooms of the reforming apparatus are heated by outer-heating system, thereby the catalyst is heated up evenly so that the gas is reformed as soon as it is introduced into the reforming room. Reformed gas with a high degree of reformation is produced soon after the operation begins. By using detachable and replaceable reforming tubes and rooms, and by simplifying apparatus for supplying the gas mixture to each reforming room, an easy to maintain and compact reformer is obtained. Irregularities in the flow of gas in the reforming catalyst is eliminated, and the gas mixture efficiently contacts the reforming catalyst. By making high-temperature reformed gas flow around the reforming tubes, heat losses from the reforming catalyst to the outside are reduced, and by preventing heat losses the endothermic reforming reaction is improved.    DETAILED DESCRIPTION - A reforming method comprises supplying a gas mixture (2) comprising a fuel, water and air, to one end of reforming rooms (6) connected in series for reformation. A reformed gas (4) containing hydrogen is discharged from the other end of the furthest downstream of the rooms (6). The gas mixture comprises fuel, water and air. A first catalyst (8a) which catalyzes a partial oxidation reaction in an oxygen environment, is loaded into the upstream end of the rooms (6). A second catalyst (8b) for reforming reaction, is charged into the downstream portion of the rooms.    An INDEPENDENT CLAIM is included for a reforming apparatus. The apparatus has a mixed gas feed tube for supplying gas mixture. A reforming tube converts the gas mixture into reformed gas containing hydrogen. The tube comprises reforming rooms connected in series. The reforming rooms are filled with catalyst (8a,8b). A gas feed apparatus is provided on the mixed gas feed tube, that directly supplies the gas mixture to the reforming room.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic view of reforming method.    Gas mixture (2)    Reformed gas (4)    Reforming room (6)    Partial oxidation catalyst (8a)    Reforming catalyst (8b)