Abstract: A force multiplier for a punch press which is sufficiently compact as to be placed in the normal throat opening of such press and yet enables the press to increase its working force by one and one-half to three times. The multiplier has a platen having a large diameter piston on its upper surface which piston has a sleeve on its upper surface, the outer surface of which is in engagement with a cylindrical wall in an upper base plate and the inner surface of which forms a cylinder wall for a second piston of smaller diameter which is engaged by the platen of the punch press.