NOVELTY - The apparatus has a hydrogen separation portion (5) which is provided with a support portion for supporting a hydrogen separation layer to selectively transmit the hydrogen. A metal catalyst is arranged in a hydrogen generation catalyst (3). The surface side of metal catalyst facing the hydrogen separation portion is supported by a porous base material. The porosity of surface side of porous base material is higher than other surface side of the porous base material so that the hydrogen is separated from the source gas. The porous base material is ceramic base material.    USE - Hydrogen production apparatus for supplying hydrogen to fuel cell.    ADVANTAGE - The hydrogen production performance and hydrogen separation productivity of hydrogen production apparatus can be improved effectively. The cost of hydrogen production apparatus can be reduced by reducing the amount of metal catalyst. The highly purified hydrogen can be separated efficiently from source gas.    DETAILED DESCRIPTION - The apparatus has a hydrogen generation catalyst that is provided with a layered structure. The main and sub catalyst layers of layered structure are supported by the porous base materials. The main catalyst layer is arranged opposite to the hydrogen separation portion. The porosity range of surface sides of porous base material is set in specific range. The difference in porosity range of surface sides of porous base material is set in specific range. The quantity of metal catalyst currently supported by the surface side of porous base material is higher than the quantity of metal catalyst currently supported by the surface side of porous base material opposite to the surface facing the hydrogen separation portion. The metal catalyst is supported by the surface side of porous base material facing the hydrogen separation portion. The metal catalyst is not supported by the surface side of porous base material opposite to the surface facing the hydrogen separation portion. The hydrogen separation portion and hydrogen generation catalyst are formed in the cylindrical shape. The hydrogen generation catalyst is arranged at the outer peripheral side of the hydrogen separation portion. The volume ratio of porous base material and support portion is set in specific range. An INDEPENDENT CLAIM is included for a manufacturing method of hydrogen generation catalyst, involves forming the molded object. The ratio of pore making material is reduced in step toward thickness direction of the molded object. The molded object is formed by press-molding the mixed powder containing the pore making material and porous base material raw material. The surface side porosity of porous base material porosity is higher than the porosity of other surface side of porous base material porosity. The metal catalyst is supported by the porous base material.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional views of the hydrogen production apparatus.    Hydrogen generation catalyst (3)    Hydrogen generation catalyst layer (3A,3B)    Hydrogen separation portion (5)    Reactor (9)