NOVELTY - The apparatus (10) has hydrogen permeable membrane (1) arranged between adjoining reformation channel (2) and hydrogen channel (3). A film support portion (4) that supports permeable membrane is positioned at the side of hydrogen channel so as to propagate hydrogen from mixed gas circulating in permeable membrane into hydrogen channel. A porous spacer (5) is arranged contacting permeable membrane, in reformation channel so as to diffuse reformed gas from reformation channel into permeable membrane while preventing deformation of permeable membrane.    USE - Apparatus for generating hydrogen gas used for fuel cell and internal combustion engine mounted in vehicle.    ADVANTAGE - Since the porous spacer is positioned in reformation channel, diffusion of reformed gas from reformation channel into hydrogen permeable membrane is performed while preventing deformation of the permeable membrane by pressure. The hydrogen permeability of the hydrogen permeable membrane is improved without need for usage of palladium for permeable membrane. Hence the stable hydrogen can be supplied over long period of time at low cost without increasing the size of the hydrogen generating apparatus. Since the size of the hydrogen generation apparatus is reduced, heat amount required for starting the hydrogen generation apparatus can be reduced and the efficiency of the fuel cell system can be improved.    DETAILED DESCRIPTION - The hydrogen generating apparatus includes several porous spacers positioned mutually at preset intervals along reformation channel so that gas permeability of each spacer differs with respect to each other. The spacer includes preset portion containing porous material to support catalyst. The porous material is made of metal-fiber cloth, sintered-metal structure and porous ceramic. The porous spacer includes joining prevention layer contacted with hydrogen permeable membrane.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the hydrogen generating apparatus.    Hydrogen permeable membrane (1)    Reformation channel (2)    Hydrogen channel (3)    Film support portion (4)    Porous spacer (5)    Hydrogen generating apparatus (10)