Injection molding machine

An injection molding machine that performs molding by injecting a molding material into a mold from a nozzle arranged on a distal end side of a barrel, comprising:

• a plunger provided inside the barrel and configured to move forward and backward in an axial direction thereof and rotate about an axis thereof;
• a feed hole configured to allow the molding material in liquid form to be fed into a front of the plunger;
• a backflow prevention member provided on a backward side of the feed hole and configured to prevent the molding material fed through the feed hole from flowing backward along the plunger;
• and
• a controller configured to control retracting movement of the plunger based on pressure of the molding material fed from the feed hole to thereby perform metering,
• wherein at least part of the feed hole is covered by a side surface of the plunger at least from start to end of the retracting movement.