NOVELTY - The gasifier (1) comprises gasifying agent supply nozzles (3,3'), slag ejection hole (8) and generated gas emission hole (6). The nozzles are provided on tangent of gasifier concentric circle. The hole (8) is provided at organic waste supply hole (2) and gasification furnace bottom portion (7) between upper- and lower-stage nozzles, respectively. The hole (6) is provided at the top portion of gasifier.    USE - For thermal decomposition and partial oxidation of organic waste, and generation of gas for fuel cells.    ADVANTAGE - The gasifier carries out thermal decomposition, partial oxidation and ash melting with high efficiency within a single gasification furnace interior. The gasifier efficiently manufactures the heating gas for electric power generating apparatus. The gasifier restrains the precipitation of solid carbon content from generated gas, by supplying water and water vapor. The gasifier increases the hydrogen concentration in generated gas by efficiently carrying out the gasification organic waste carbon content within a short period of time.    DETAILED DESCRIPTION - The gasifier comprises supply nozzles, a slag extraction hole and a generated gas extraction hole. The supply nozzles which supplies gasifying agent to the cylindrical upper-stage and lower-stage portions, were provided on the tangent of concentric circle of the gasifier such that the gasifying agent supply nozzle forms a rotational flow. The extraction hole is provided at the supply hole of organic waste and the gasification furnace bottom portion between upper-stage nozzle and lower-stage nozzle, respectively. The generation gas extraction hole is provided at the top portion of the gasifier. The organic waste mainly containing plastic and gasifying agent are supplied to the gasifier. The gasifier produces the gas having hydrogen and carbon monoxide as main component, by thermal decomposition reaction and partial oxidation reaction of organic waste. An INDEPENDENT CLAIM is also included for organic waste gasification electric power generating apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows the sectional drawing of a gasifier.    gasifier (1)    organic waste supply hole (2)    gasifying agent supply nozzles (3,3')    generated gas emission hole (6)    gasification furnace bottom (7)    slag ejection hole (8)