NOVELTY - Pressure of source gas containing hydrogen and carbon monoxide is increased, hydrogen and carbon monoxide are subjected to catalytic reaction, and cooled to liquefaction temperature. Then, gas component and liquid component including hydrocarbon fuel are separated. The unreacted fuel components in gas component are recovered using membrane separation method or physical adsorption method, and recycled as source gas. Thus, hydrocarbon fuel is manufactured.    USE - Manufacture of hydrocarbon fuel from by-product gas discharged from iron mill.    ADVANTAGE - The method efficiently provides hydrocarbon fuel.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for hydrocarbon fuel manufacturing apparatus, which contains impurity removal device (1) which removes impurity from source gas, desulfurization processor (2) which carries out desulfurization of source gas, compressor (3) which increases pressure of source gas to predetermined pressure, catalytic reactor (4) in which hydrogen and carbon monoxide are reacted in presence of catalyst, gas cooler (5) which cools the off gas discharged from catalytic reactor to liquefaction temperature, gas-liquid separator (6) which separates liquid component and gas component in off gas, fuel storage container (7) which stores obtained liquid component as hydrocarbon fuel, recovering unit (9) which recovers unreacted fuel component, buffer tank (16) which stores unreacted fuel component, and collection component supply line (10) which supplies fuel component as source gas from buffer tank to compressor.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of hydrocarbon fuel manufacturing apparatus. (Drawing includes non-English language text)    Impurity removal device (1)    Desulfurization processor (2)    Compressor (3)    Catalytic reactor (4)    Gas cooler (5)    Gas-liquid separator (6)    Fuel storage container (7)    Gas turbine (8)    Recovering unit (9)    Collection component supply line (10)    Buffer tank (16)