Disclosed are a slide inclination correcting method and a slide inclination correcting apparatus in press machinery having a slide drive mechanism disposed in a top area of a press machine for driving a slide via a plurality of points to vertically move it up and down, thereby forming a work piece. According to the invention, the method and apparatus include the steps of, and means for, finding by measurement or computation for each of dies or die sets an eccentric load that is to develop in the slide in the process of forming a work piece to prepare a die based slide inclination correcting data for each of the dies or die sets; and on the basis of the die based slide inclination correcting data prepared, pre-imparting to the slide a compensatory amount of inclination which corresponds to a predicted amount of inclination caused the slide due to the eccentric load found.