NOVELTY - Biomass thermal decomposition oil (60) is manufactured by material supply step consisting of mixing biomass, carbon material, water, and calcium oxide, reacting water and calcium oxide to obtain calcium hydroxide, heating, adjusting moisture content, mixing to obtain liquid biomass feedstock, and pumping, thermal decomposition step consisting of irradiating with microwave using microwave heating unit and reacting carbon dioxide gas by-product with calcium hydroxide to obtain calcium carbonate, and oil discharge step by discharging produced biomass thermal decomposition oil.    USE - Manufacturing method of biomass thermal decomposition oil for fuel.    ADVANTAGE - The process is suitable for mass industrial production, and yield, concentration, and amount of combustion heat are high.    DETAILED DESCRIPTION - Biomass thermal decomposition oil (60) is manufactured by material supply step consisting of mixing biomass, carbon material, water, and calcium oxide, reacting water and calcium oxide to obtain calcium hydroxide, heating biomass with the reaction heat, adjusting moisture content, mixing to obtain liquid biomass feedstock, and pumping the biomass feedstock, thermal decomposition step consisting of irradiating with microwave using microwave heating unit for 10-1200 s at 180-250 degrees C and reacting carbon dioxide gas by-product with calcium hydroxide to obtain calcium carbonate, and oil discharge step by discharging produced biomass thermal decomposition oil. An INDEPENDENT CLAIM is included for manufacturing apparatus (100) of biomass thermal decomposition oil comprising material supply part (110) consisting of mixing unit where raw materials are mixed and reacted to obtain liquid biomass feedstock and pumping unit, microwave heating unit, thermal decomposition part, and oil discharge part (150).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the biomass thermal decomposition oil manufacturing apparatus.    Biomass thermal decomposition oil (60)    Biomass thermal decomposition oil manufacturing apparatus (100)    Material supply part (110)    Thermal decomposition part (120)    Oil discharge part (150)