NOVELTY - A thermal reforming apparatus comprises a pressure control apparatus (51) which prevents gas mixing between a combustion chamber (15) and a reforming chamber (14). A steam nozzle (38) prevents gas mixing produced at the back of a thermal storage body (2).    USE - For manufacturing hydrogen for use in electric power generation and a fuel cell.    ADVANTAGE - The thermal reforming apparatus does not use a catalyst in reforming reaction. The pressure control apparatus and the steam injection mechanism in the thermal reforming apparatus prevents gas mixing between source gas and combustion gas and reduces the decrease of the calorific value of the reformed gas. A fuel gas of high calorific value can be obtained.    DETAILED DESCRIPTION - A thermal reforming apparatus comprises a rotary thermal storage body at an opening of a fire-resistant furnace wall (12). A partition (35) divides the inside into a combustion chamber and a reforming chamber. The furnace wall faces the front end of the partition. The apparatus heats up the source gas (SG) introduced into the reforming chamber by heat exchange with the thermal storage body and reforms it while allowing passing through the combustion gas (EG) generated in the combustion chamber and supplying heat to the thermal storage body. A pressure-control apparatus prevents gas mixing between the combustion chamber and the reforming chamber. A steam injection mechanism prevents gas mixing produced at the back of the thermal storage body.    DESCRIPTION OF DRAWING(S) - The figure shows a longitudinal cross-sectional view of a thermal-reforming apparatus.    Thermal storage body (2)    Casing (11)    Furnace wall (12)    Partition (13)    Reforming chamber (14)    Pressure nozzles (14p, 15p)    Combustion chamber (15)    Reformed gas discharge pipe (16)    Burner (17)    Conduction part (21)    Heat-resistant component (22)    Drive mechanism (25)    Honeycomb body (26)    Collar (31)    Slider (32)    Source gas inlet tube (33)    Combustion gas discharge pipe (34)    Partition (35)    Inner cylinder (36)    Steam scraper launcher (37)    Team nozzle (38)    Pressure control apparatus (51)    Reforming chamber thermometer (110)    Combustion chamber thermometer (111)    Supplementary fuel (AF)    Combustion air (AG)    Combustion gas (EG)    Fuel gas (FG)    Steam (LS)    Reformed gas (RG)    Source gas (SG)