To prevent generation of uneven grinding or dispersion in grinding thickness by fixing a work to a face plate, and pressing a part in the vicinity of the center of gravity of the work against a turn table through a universal joint for grinding.

A work 3 is ground by turning a turn table 2 while spraying the liquid type grinding solution. One work 3 is fixed to one face plate 6, and a part in the vicinity of the center of gravity of the work 3 is pressed against the turn table 2 through a universal joint 8, and slides. The surface of the work 3 is attached in a copying manner to the surface of the turn table 2, and the force is applied to a surface to be ground of the work 3 only in the normal direction, and the surface of the work 3 closely attached to the turn table 2 is uniformly ground flat even without flattening in the grinding operation.