Patent ID: 7081950

Claim:
A stage device comprising: a base plate which includes a reference surface; a stage which can move along the reference surface; a mass body which can move with respect to said base plate or a structure of said base plate; and a control unit which drives and controls said mass body so as to cancel a reaction force in a translational direction generated during a movement of said stage and an offset load about a horizontal axis, and to reduce a rotational reaction force about a vertical axis, wherein said control unit includes a mass body model control unit which generates a virtual control target value of said mass body to cancel the rotational reaction force about the horizontal axis generated during the movement of said stage, on the basis of target position information of said stage, and a mass body model based on the virtual control target value, and said control unit drives and controls said mass body by using virtual positional information of the mass body model as an actual mass body control target value.