NOVELTY - The source gas containing methane, ethane, propane, butane, kerosene and naphtha is supplied from inlet port of reaction tube (1). The mixed gas containing hydrogen, carbon monoxide and carbon dioxide is produced by modification and shift reaction. The hydrogen separated from the mixed gas in the separating column by passing through permselective membrane (5), is recovered from discharge port (11) of separating column (4). The other gas component which does not permeate the permselective membrane is discharged from the exit of reaction tube.    USE - For producing hydrogen used for fuel cell.    ADVANTAGE - The hydrogen gas is manufactured efficiently using reactor having permselective membrane with high permeability.    DETAILED DESCRIPTION - A permselective membrane type reactor has a reaction tube (1) having inlet port (9) and exit (10) for gases, a separating column (4) having a permselective membrane (5) inserted in the reaction tube with selectively permeates hydrogen, and a discharge port (11) to discharge cracked gas permeating the permselective membrane, and a layer consisting of modification reaction catalyst (6) which promotes modification reaction of methane, ethane, propane, butane, kerosene and naphtha. The source gas containing methane, ethane, propane, butane, kerosene and naphtha is supplied from inlet port of a reaction tube. The mixed gas containing hydrogen, carbon monoxide and carbon dioxide is produced by modification and shift reaction. The hydrogen separated from the mixed gas in the separating column by passing through the permselective membrane, is recovered from the discharge port of the separating column. The other gas component which does not permeate the permselective membrane is discharged from the exit of reaction tube. The modification reaction catalyst is iron, cobalt, nickel, copper, molybdenum, ruthenium, rhodium, palladium, silver, tungsten, rhenium, osmium, iridium, platinum and/or gold. The permselective membrane is palladium or its alloy film.An INDEPENDENT CLAIM is included for permselective membrane-type reactor.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic sectional drawing of the structure of permselective membrane-type reactor. (Drawing includes non-English text)    Reaction tube (1)    Separating column (4)    Permselective membrane (5)    Modification reaction catalyst (6)    Inlet port (9)    Exit (10)    Discharge port (11)