An injection molding machine comprising: a cylinder that is adapted to heat a molding material; a screw that is rotatably and reciprocatably provided in the cylinder; a rotary driving unit that is adapted to rotate the screw; a reciprocation driving unit that is adapted to reciprocate the screw; a pressure detector that is adapted to detect a pressure of the molding material reserved in front of the screw; a control unit that is adapted to control the rotary driving unit and the reciprocation driving unit, characterized in that the control unit is configured to perform a first type of plasticizing process, a mold unit being opened while performing the first type of plasticizing process, in which the screw is moved backward to a predetermined position and the screw is rotated at the predetermined position to transfer the molding material forward to reserve the molding material in front of the screw, perform a first type of filling process in which the screw is moved forward to inject the molding material reserved in front of the screw in the first type of plasticizing process from the cylinder to be filled in the mold unit, monitor the pressure in the first type of filling process by the pressure detector, perform a second type of plasticizing process, being performed while the mold unit is not opened, in which the screw is rotated to transfer the molding material forward to reserve the molding material in front of the screw under a state that the screw is moved backward to a predetermined position by the pressure caused by the molding material reserved in front of the screw, perform a second type of filling process in which the screw is moved forward to inject the molding material reserved in front of the screw in the second type of plasticizing process from the cylinder to be filled in the mold unit, and monitor the pressure in the second type of filling process by the pressure detector, wherein the control unit is configured to correct the setting of the first type of plasticizing process based on the pressure monitored in the first type of filling process and the pressure monitored in the second type of filling process. a cylinder that is adapted to heat a molding material; a screw that is rotatably and reciprocatably provided in the cylinder; a rotary driving unit that is adapted to rotate the screw; a reciprocation driving unit that is adapted to reciprocate the screw; a pressure detector that is adapted to detect a pressure of the molding material reserved in front of the screw; a control unit that is adapted to control the rotary driving unit and the reciprocation driving unit, characterized in that the control unit is configured to perform a first type of plasticizing process, a mold unit being opened while performing the first type of plasticizing process, in which the screw is moved backward to a predetermined position and the screw is rotated at the predetermined position to transfer the molding material forward to reserve the molding material in front of the screw, perform a first type of filling process in which the screw is moved forward to inject the molding material reserved in front of the screw in the first type of plasticizing process from the cylinder to be filled in the mold unit, monitor the pressure in the first type of filling process by the pressure detector, perform a first type of plasticizing process, a mold unit being opened while performing the first type of plasticizing process, in which the screw is moved backward to a predetermined position and the screw is rotated at the predetermined position to transfer the molding material forward to reserve the molding material in front of the screw, perform a first type of filling process in which the screw is moved forward to inject the molding material reserved in front of the screw in the first type of plasticizing process from the cylinder to be filled in the mold unit, monitor the pressure in the first type of filling process by the pressure detector, perform a second type of plasticizing process, being performed while the mold unit is not opened, in which the screw is rotated to transfer the molding material forward to reserve the molding material in front of the screw under a state that the screw is moved backward to a predetermined position by the pressure caused by the molding material reserved in front of the screw, perform a second type of filling process in which the screw is moved forward to inject the molding material reserved in front of the screw in the second type of plasticizing process from the cylinder to be filled in the mold unit, and monitor the pressure in the second type of filling process by the pressure detector, wherein the control unit is configured to correct the setting of the first type of plasticizing process based on the pressure monitored in the first type of filling process and the pressure monitored in the second type of filling process.