Abstract: A lightweight, compact, and low-cost two-plate type injection apparatus attached to an injection molding machine which includes an injection screw (50) spline-connected to a screw sleeve which is rotatably supported by a pusher plate (20) movable toward and away from a front plate (10). The screw is coupled through a transmission mechanism (62, 63) to a metering motor (160) which is fixed to the top face of the pusher plate so that the motor body is located above and between the two plates. First and second ball screws (91, 92), which are individually rotatably supported by the front plate, are threadedly engaged with first and second ball nuts, respectively, which are fixed to the pusher plate, and are coupled through a transmission mechanism (111 to 113) to an injection motor (140) which is fixed to the front plate so that the injection motor body is located above and between the front plate and the pusher plate and does not interfere with the metering motor body.