NOVELTY - The apparatus has main and sub heat exchange portions (20, 20'), each provided with heating units (21, 21'), reforming units (22, 22'), and carbon dioxide (CO) removal units (23, 23'), respectively. A raw material comprising hydride, which is to be reformed, and a combustion gas mixture consisting of fuel and air, are supplied alternately, to the heat exchange portions, through various selector valves.    USE - Used for producing hydrogen gas, by reforming liquid fuels such as gasoline and light oil, or hydrocarbon compounds such as methanol and natural gas, or hydride containing carbon, for supplying hydrogen gas to fuel cells of vehicles.    ADVANTAGE - Enables selectively heating the reforming units, with the heat of combustion gas produced by performing combustion of mixture of air and fuel, in the heating units, during starting of the hydrogen production apparatus. Hence improves the stability of the apparatus. Enables performing air-cooling of the CO removal unit, by supplying only air to the CO removal unit. Reduces the start-up time of the apparatus, as the heating units are heated directly.    DETAILED DESCRIPTION - The reforming units reform the raw material heated by the heating units, to produce reformed gas containing hydrogen. Combustion gas is produced in the heating units, by the combustion of the combustion-gas mixture. Separate supply units supply raw material, fuel, air, to the heat exchange portions. Selector valves are provided for changing the flow path of raw material, so that the raw material is selectively supplied to one of the heat-exchange portions, and for changing the flow path of reformed gas, so that reformed gas is supplied selectively, from one of the heat exchange portions, to a hydrogen consumption apparatus. Selector valves are provided for changing the flow path of fuel, and air, respectively, so that fuel for performing combustion process, is selectively supplied to the reforming unit of the heat exchange portion, to which the raw material has not been supplied, and to the reforming unit to which fuel has been supplied. A selector valve is provided to change the flow path of combustion gas ejected from the heat-exchange portions, so that combustion gas is selectively ejected outside the apparatus, from the heat-exchange portions. A selector valve changes the flow path of fuel, so that fuel is supplied to the reforming unit or to the corresponding CO removal unit. A selector valve enables supplying air to the CO removal unit to which fuel has been supplied. The heating units and reforming units, which comprise thermal storage units, hold oxidation catalyst. The CO removal unit also comprises a thermal storage unit. The fuel consists of same hydrocarbon compound used for forming the hydride contained in the raw material, and consists of waste gas containing hydrogen, which is ejected from hydrogen consumption apparatus comprising a fuel cell. Air is supplied between the reforming unit and CO removal unit of each heat-exchange portion. A selector valve enables selectively supplying exhaust gas from one heat-exchange portion, to the other portion.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a hydrogen production apparatus. (Drawing includes non-English language text).