The invention provides an injection molding machine. In the injection molding machine that uses a motor to rotate a ball screw to open and close a mould, actuator movements of the rotation of the ball screw can be prevented in a way of open linkage with a safety door. The injection molding machine is provided with a screw shaft (34) of a screw feeding mechanism (31) that can rotate when a movable component (20) is moved, and a braking mechanism (43) that is used to prevent the screw shaft (34) of the screw feeding mechanism (31) from rotating, wherein the open linkage between the braking mechanism (43) and the safety door (41, 42) is not moved with the electric control way.