PURPOSE: To remove runner, etc., to the outside of dies by rotatably attaching a lever whose one end is coupled with a knock pin attached to the core die body to be touched by or separated from the cavity die body and the other end is coupled with an ejector pin to an extruding plate.

CONSTITUTION: After resin is hardened by cooling, the core die body 2 is separated from the cavity die body, and at the same time an extruding plate 13 is pushed by a drive rod. Whereupon, an ejector pin 14 is projected from the core die body 2 to push out a product and also runners R1 and R2 are cut off by gates G1 and G2. When the extruding plate 13 moves, it comes into contact with flanges 21a and 22a to project an ejector pin 21 and a releasing pin 22, and the runners R1 and R2 are removed without being dropped from the contact portion 21b. As the plate 13 further moves, the knock pin 30 is coupled with one end of the lever 27 and turned, the releasing pin 22 goes forward with a longer stroke than that of the ejector pin 21, and the runners R1 and R2 are exactly scraped down and dropped to the outside of the dies.