Grinding processing method

To provide a technique which enables an idle running start position to be appropriately corrected. A grinding processing method for grinding the surface of a workpiece by bringing a grindstone and the workpiece into contact with each other after idle running that enables safe contact while rotating the grindstone and the workpiece by controlling a slide rest that relatively reciprocates the grindstone and the workpiece, wherein the position or displacement amount of a slide rest is measured when machine elastic deformation included in the displacement of the slide rest has entered a negligible state while the grindstone is returned to the original position thereof after the workpiece was ground to a processing target position, a correction value for an idle running start position is calculated on the basis of the position or displacement amount of the slide rest, and a next idle running start position is corrected on the basis of the correction value.