PROBLEM TO BE SOLVED: To provide a resin raw material supply device for a synthetic resin molding machine capable of removing the gas generated in the casing of a heating cylinder at the time of a metering process to efficiently manufacture a synthetic resin molded product without causing the quality defectiveness in the product due to the molding machine.
SOLUTION: In the resin raw material supply device installed at the raw material charging port 70 of the heating cylinder 71 of the synthetic resin molding machine comprising a screw 71a and the casing 71b, a raw material charging inner cylindrical part 5 and an exhaust outer cylindrical part 6, which is provided with a gas suction port 61, surrounding the inner cylindrical part 5 are connected to the raw material charging port 70 and a damper 42 is provided to the inner cylindrical part 5 while an atmosphere opening valve 53 for allowing air to flow in the heating cylinder 71 from the outside of the supply device through the inner cylindrical part 5 is provided between the damper 42 and the inner cylindrical part 5. A control means 9 for receiving a predetermined control signal to control the atmosphere opening valve 53 so as to automatically open the same is provided.
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