NOVELTY - An organic product-producing apparatus comprises a reactor having main screws that are arranged side-by-side to confront the peripheral edges of the screw threads of neighboring main screws with each other. Each main screw acts to forward the reaction mixture at a velocity that is different from each other.    USE - The invention is used for producing organic products from fibrous organic raw material, particularly from organic wastes e.g. agricultural residues, food residues, and industrial organic wastes from factories. The obtained product maybe used as e.g. raw materials for industrial products, food components, and raw materials for fodders and soil conditioners.    ADVANTAGE - The inventive apparatus allows the fibrous organic substances contained in the raw material to be loosened and subjected to effective splitting and breaking into short fragments, while eliminating microbes. It produces organic products exhibiting high performance in water-retentiveness and in gas permeability.    DETAILED DESCRIPTION - An organic product-producing apparatus comprises a reactor (1) for effecting biological or biochemical reaction. The reactor is provided with a raw material supply port (22), main screws (6, 7) and a processed product exit port (31). The main screws are arranged side-by-side to confront the peripheral edges of the screw threads of neighboring main screws with each other, and to act each to forward the reaction mixture (3) at a velocity that is different from each other.    An INDEPENDENT CLAIM is also included for a method of producing organic product comprising supplying a raw material containing fibrous organic substance to the inventive reactor. A biological or biochemical reaction is effected in the reactor while the fibrous organic substance is subjected to splitting and breaking by the screws.    DESCRIPTION OF DRAWING(S) - The figure shows the organic product production apparatus.    Reactor (1)    Reaction mixture (3)    Main screws (6, 7)    Cooperative screws (8, 9)    Raw material supply port (22)    Processed product exit port (31)