NOVELTY - The apparatus comprises a modification chamber (12) carrying a modification catalyst bed (13) for performing steam reforming of coal property fuel to form hydrogen gas (H2), H2 gas permeable thin film pipe (14) through which H2 gas formed in the modification chamber permeates into a H2 gas isolation space (16) and an oxidation chamber (22) (carrying an oxidation catalyst bed (23)), which supplies heat to the modification chamber.    USE - For manufacturing hydrogen used for electrically driven motor vehicles and power generation.    ADVANTAGE - The modified gases other than hydrogen are rendered harmless and ejected. A separate installation is not required for treating the non-permeated reformed gases. Hydrogen gas permeation flow rate is raised and modification temperature and thin film double sided pressure difference are lowered. Conversion ratio of coal property fuel or hydrocarbon is raised and heat energy consumed is reduced. The manufacturing apparatus is compact.    DETAILED DESCRIPTION - The apparatus comprises a modification chamber (12) carrying a modification catalyst bed (13) for performing steam reforming of coal property fuel to generate hydrogen gas, at least one H2 gas permeable thin film pipe (14) through which H2 gas formed in the modification chamber is permeated into an H2 gas isolation space (16) and at least one oxidation chamber (22) carrying an oxidation catalyst bed (23), which supplies heat to the modification chamber. Gas non-permeated into the thin film pipe is burnt.    An INDEPENDENT CLAIM is also included for hydrogen production, comprising supplying a mixture containing coal property fuel to the modification catalyst bed where water vapor modification reaction is performed to generate hydrogen gas and other modified gases. Hydrogen gas is extracted in the hydrogen gas isolation space and other modified gases are introduced into the oxidation chamber where they are oxidized in the presence of catalyst and converted into non-contaminated gases.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a double jacket tube type reactor.    Modification chamber (12)    Modification catalyst bed (13)    Hydrogen gas permeable thin film pipe (14)    Hydrogen gas isolation space (16)    Outer side casing (21)    Oxidation chamber (22)    Oxidation catalyst bed (23)