The present invention provides an inject ion molding machine which can reduce an amount of a lubricant used to lubricate a drive shaft (63) and a rotating member. An injection molding machine includes a tubular rotating member (45b), a drive shaft (63) which is disposed on an inner peripheral side of the rotating member (45b) and rotates and moves linearly by a rotary motion of the rotating member, and a return member (72)which causes a lubricant separated from the drive shaft to be close to the drive shaft.