PURPOSE: To improve a surface roughness, by providing the land which feeds the air or liquid in a static pressure to a support member fixing a work fitting device to a table, and regulating the movements in the horizontal direction and vertical direction of the work fitting device by this air or liquid.

CONSTITUTION: The movements in the horizontal direction and vertical direction are regulated with a work fitting device (an electromagnetic chuck)20 being floated, by feeding a gaseous body A or liquid L in a static pressure state to the land 17 of a support member 11. Go that, even in case of a table 7 being vibrated, the vibration thereof is absorbed by the clearance between the work fitting device 20 and support member 11, and the transmission of the vibration to the work fitting device 20 is eased.