PURPOSE: To enable full-automatic molding without raising the production cost of a mold by operating a gate cutting core cooperated with mold opening in slide contact with a gate part to cut off the connection of a product and a runner.

CONSTITUTION: When a mold is opened at the time of the taking-out of a product by mold opening, the product 1 and a molding part 4 by a sprue bush 2 are separated from a fixed template 11 by the spring 7 built in the mold to be left on a movable template 12 but, at this time, a gate cutting core 12 is operated in slide contact with a gate part by a core spring 15 to cut off the connection of the product 1 and the molding part 4 by the sprue bush. After mold opening, a movable push-out plate 8 is moved and movable push-out pins 9, 10 are cooperated to push out the product 1 and the molding part 4 by the sprue bush 2 from the movable template 12 to release them but, at this time, the product 1 and the molding part 4 by the sprue bush 2 are cut off, only the product 1 is taken out to be automatically packed.