Provided is an injection molding machine that detects foreign bodies between the metal molds during a low pressure mold-closing process that is performed before a high pressure mold-closing process, and if such a problem occurs, can promptly stop the metal mold closure action of the servo motor at a stage prior to when the high pressure mold-closing process is performed. The injection molding machine (1): is provided with a servo motor (17) that performs the metal mold-opening and -closing, and a torque-detecting means (23) for detecting the actual torque of the servo motor (17); and drives the servo motor (17), performing as mold-closing processes, in order, a high speed mold-closing process, a low pressure mold-closing process and a high pressure mold-closing process. The injection molding machine (1) is provided with a malfunction-determining means (25) for determining that a foreign body is present between the metal molds when the actual torque (x) of the servo motor (17) that is generated during the open mold side of the low pressure mold-closing process deviates from a previously established range of normal values; and a servo motor-stopping means (26) for emergency stopping of the driving of the servo motor (17) when the malfunction-determining means (25) determines that a foreign body is present.