A molded product production system includes at least two measuring feeders configured to simultaneously adjust an amount of a discharged powdery material to a target value and feed the powdery material, a mixer configured to mix at least two powdery materials fed from the measuring feeders to obtain mixed powdery materials, a filler configured to fill, with the mixed powdery materials obtained by the mixer, a die bore of a compression-molding machine configured to compress a powdery material to mold a molded product, a sensor configured to measure a mixing degree of the mixed powdery materials obtained by the mixer, and a controller configured to adjust an amount of at least one of the powdery materials fed by the measuring feeders, or motion speed of a mixing member configured to agitate powdery materials in the mixer in accordance with the mixing degree of the mixed powdery materials measured by the sensor.