NOVELTY - A hydrogen generating apparatus comprises at least one first unit reaction device comprising a plate assembly (41') for combustion comprising a combustion catalyst and a plate assembly (41'') for reforming reaction comprising a reforming catalyst, where each plate assembly comprises two micro-channel plates (45, 45') having micro-channels (51, 51') on surfaces, and which are combined to each other in a manner that the micro-channels are opposed to each other. The combustion catalyst and the reforming catalyst are contained in micro-channels. The plate assemblies are stacked alternately.    USE - For generating hydrogen, useful as fuel for fuel cell system, by using alcohol such as methanol as raw material.    ADVANTAGE - The apparatus generates hydrogen with high heat efficiency (i.e. 59.5%) and high conversion ratio to hydrogen. The method achieves the conversion ratio of methanol of 99%. The hydrogen generating apparatus and the method for generating hydrogen with high heat efficiency and high conversion ratio to hydrogen are effective for supplying hydrogen to a fuel cell system by using alcohol such as methanol as a fuel since all of the combustion reaction and the reforming reaction can be conducted by using micro-channel. The hydrogen generating apparatus can be very smaller by the gasification by heat exchange, and attached directly to fuel cell to supply hydrogen by reducing the content of carbon monoxide. The production amount of hydrogen can be controlled optionally only by adjusting the stacking number of the plate assemblies by constituting the plate assemblies for combustion and the plate assemblies for reforming reaction as a unit. The fuel cell can be operated without deactivating the electrode of the fuel cell by removing carbon monoxide as much as possible by further including preferential oxidation reactor.    DETAILED DESCRIPTION - A hydrogen generating apparatus comprises at least one first unit reaction device comprising a plate assembly (41') for combustion comprising a combustion catalyst and a plate assembly (41'') for reforming reaction comprising a reforming catalyst, where each plate assembly comprises two micro-channel plates (45, 45') having micro-channels (51, 51') on surfaces, and which are combined to each other in a manner that the micro-channels are opposed to each other. The combustion catalyst and the reforming catalyst are contained in micro-channels. The plate assemblies are stacked alternately. The apparatus also comprises at least one second unit reaction device for gasification, and at least one third unit for heat exchange.    DESCRIPTION OF DRAWING(S) - The figure shows a diagram illustrating disassembly of only plate assemblies constituting the unit reaction device.    plate assembly for combustion (41')    plate assembly for reforming reaction (41'')    micro-channel plates (45, 45')    inlets (46, 46')    micro-channels (51, 51')