To surely conduct stripping of a punch tool without damaging a plate.

A plate pushing down means 25, in which the neighborhood of a punched hole punched with a punch tool 6 of a plate W is pushed down by injection of high pressure fluid, is arranged near the punching tool 6. This plate pushing down means 25 starts injection of high pressure fluid when the punch tool 6 reaches the bottom dead center. Further, a contact pushing down means to push down, which is brought into contact the neighborhood of a punched hole and pushes down the neighborhood, is arranged to the punch tool 6, the contact pushing down means assists ejection of the punch tool 6 from a punched hole in corporation with the plate pushing down means 25.