NOVELTY - A biodiesel fuel oil production apparatus (1) has a heating apparatus which heats raw material oil fat and which is equipped with heating tank (4) having outlet port (21), exchangeable processing column (5) which has inlet connected to outlet port of the heating tank and exit, reaction tank (6) which is detachably connected with the exit of the processing column (5), storage tank (10) which is connected to the reaction tank, 3-way valve (7) which is connected to outflow port of reaction liquid of reaction tank, and processing column (8) which has inlet connected to 3-way valve and exit.    USE - Apparatus for manufacture of biodiesel fuel oil (claimed) used as fuel for transportation.    ADVANTAGE - The biodiesel fuel oil production apparatus is compact and enables rapid and stable manufacture of biodiesel fuel oil of improved quality.    DETAILED DESCRIPTION - A biodiesel fuel oil production apparatus has a heating apparatus which heats raw material oil fat and which is equipped with heating tank having outlet port for raw material oil fat, exchangeable processing column (5) which has inlet detachably connected to outlet port of the heating tank and exit formed at upper and lower portion of the inlet, reaction tank which is detachably connected with the exit of the processing column (5), storage tank which is connected to the reaction tank and which supplies lower alcohol solution containing dissolved alkali catalyst to the reaction tank, 3-way valve which is connected to outflow port of reaction liquid of the reaction tank, and processing column (8) which has inlet detachably connected to the 3-way valve and exit formed at upper and lower portion of the inlet. The reaction tank has a stirring apparatus. Processing column (5) is filled with acid adsorption agent and moisture-content absorber. Processing column (8) is filled with base adsorption agent and moisture-content absorber. INDEPENDENT CLAIMS are included for the following:    (1) exchangeable adsorption agent packed column, which is the exchangeable processing column (5) or processing column (8) having container having indicator for adsorption agent function measurement with color change with pH change and/or indicator for water absorption measurement with moisture content change, and transparent walls; and    (2) manufacture of biodiesel fuel oil, which involves heating the raw material oil fat at a temperature less than the boiling point of lower alcohol used for transesterification and more than the liquid state temperature of the raw material oil fat, passing the raw material oil fat into processing column (5), removing moisture content and free fatty acid in the raw material oil fat, introducing the raw material oil fat into reaction tank with lower alcohol solution with dissolved alkali catalyst, mixing, stirring and performing transesterification of the raw material oil fat and solution, removing liquid containing layer containing glycerin as main component and layer containing fatty acid alkyl ester as main component, separating liquid or layer containing glycerin as main component by dead weight or centrifugation, passing liquid of layer containing fatty acid alkyl ester as main component into processing column (8) and removing moisture content and impurity in the fatty acid alkyl ester.    DESCRIPTION OF DRAWING(S) - The drawing shows the longitudinal cross-sectional view of the biodiesel fuel oil production apparatus.    Biodiesel fuel oil production apparatus (1)    Heating tank (4)    Processing column (5,8)    Reaction tank (6)    Valve (7)    Storage tank (10)    Outlet port of heating tank (21)