To prevent a damage to a wrench for a plunger when a spring plunger is screwed in, and to surely screw the spring plunger in.

In the plunger attached by screwing into a tapped hole of a lower die, it is provided with a cylindrical main body 16 having a screw part 15 screwed into the screw hole, and a pin 17 which is provided at the end of the body in a retractable manner along the axis of the body, and removes a work from the lower die by projection caused by an energizing force when a upper die retracts after forming. And at an end of the cylindrical main body 16 of the spring plunger for a die, the spring plunger which is attached into the tapped hole by turning with a wrench for the plunger, a pair of sector- shaped recessed parts 18 almost symmetric with respect to the pin 17 is provided, and projecting parts of the wrench for the plunger are fit into the pair of the concave part, and they are turned with the wrench.