An injection molding machine includes: a fixed side member; and a movable side member fixed to the fixed side member, the movable side member being driven by a motor in order to perform injection molding of a molded product. The injection molding machine further includes a power feeding apparatus, one or more motors, and at least one servo amplifier. The power feeding apparatus converts a three-phase AC voltage into a DC voltage. The one or more of the motors are provided in the movable side member and drive the movable side member. The at least one servo amplifier is provided in the movable side member and drives one of the one or more of the motors by the DC voltage being supplied thereto through a DC power supply line.

An embodiment of the present invention provides an injection device including a screw that includes a plurality of outer circumferential protrusions, each of the plurality of outer circumferential protrusions being provided with an outer circumferential protrusion slope and a second outer circumferential protrusion slope. A bush of the injection device includes a plurality of inner circumferential protrusions, each of the plurality of inner circumferential protrusions being provided with an inner circumferential protrusion slope and a second inner circumferential protrusion slope. A rear end of each of the plurality of outer circumferential protrusions and a front end of each of the plurality of inner circumferential protrusions include no flat surface.

An injection molding machine includes: a fixed side member; and a movable side member fixed to the fixed side member, the movable side member being driven by a motor in order to perform injection molding of a molded product. The injection molding machine further includes a power feeding apparatus, one or more motors, and at least one servo amplifier. The power feeding apparatus converts a three-phase AC voltage into a DC voltage. The one or more of the motors are provided in the movable side member and drive the movable side member. The at least one servo amplifier is provided in the movable side member and drives one of the one or more of the motors by the DC voltage being supplied thereto through a DC power supply line.