NOVELTY - A manufacturing system of biodiesel fuel oil has a thermal decomposition tank (11) having fluid bed structure, a condenser (13) for condensing thermal decomposition oil from pyrolysis gas of tank (11), a distilling column (16) for distilling thermal decomposition oil and separating thermal decomposition middle distillate from thermal decomposition light oil and thermal decomposition heavy oil, and a refining device (17) for obtaining biodiesel fuel oil from separated middle distillate.    USE - System used for manufacturing biodiesel fuel oil.    ADVANTAGE - The system efficiently enables to manufacture biodiesel fuel oil with low viscosity, low pour point and high cetane number.    DETAILED DESCRIPTION - A manufacturing system of biodiesel fuel oil thermally decomposes one or more raw material chosen from palm bunches, palm fruit, palm powder, palm oil, fruit of coconut palm, coconut oil, fruit of Jatropha, vegetable waste edible oil, animal waste edible oils, and their decomposed material, and manufactures biodiesel fuel oil. A decomposition catalyst chosen from an alkali compound and a porous inorganic oxide is mixed with flow sand (11A), crushed raw material is thrown into a tank, and high temperature steam is supplied from a hearth lower direction. The raw material is heated when flow sand is flowing with the raw material. The raw material is thermally decomposed, pyrolysis gas is extracted out of tank, and thermal decomposition residue is discharged from tank with some flow sand. The system has a thermal decomposition tank having fluid bed structure, a condenser for condensing thermal decomposition oil from pyrolysis gas of tank, a distilling column for distilling thermal decomposition oil and separating thermal decomposition middle distillate from thermal decomposition light oil and thermal decomposition heavy oil, and a refining device for obtaining biodiesel fuel oil from separated middle distillate.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of manufacturing system of biodiesel fuel oil. (Drawing includes non-English language text)    Thermal decomposition tank (11)    Flow sand (11A)    Condenser (13)    Distilling column (16)    Refining device (17)