To facilitate with high accuracy adjustment of a minute angle degree and also to sufficiently secure the rigidity of a whole device after the adjustment. Provided are a workpiece attaching body 24 having a workpiece attaching surface 4 and a rotating body 7 for rotatably supporting the workpiece attaching body 24, the rotating body 7 has an inclination angle adjusting surface 8 inclined relative to an axis of the rotating body, and opposite to the workpiece attaching surface 4, the workpiece attaching body 24 includes an inclination angle adjusting surface 9 which is inclined relative to the workpiece attaching surface 4 and which comes in surface contact with the inclination angle adjusting surface 8 of the rotating body 7, the rotating body 7 is arranged therein with an inclination angle adjusting shaft 36, protruding toward a side of the workpiece attaching body 24 substantially vertically to the inclination angle adjusting surfaces 8 and 9, for relatively rotatably supporting the workpiece attaching body 24, and coupling means 14 for coupling the rotating body 7 and the workpiece attaching body 24 in a manner to enable rotation adjustment about the inclination angle adjusting shaft 36 is provided, whereby the rotating body 7 and the workpiece attaching body 24 are relatively rotated about the inclination angle adjusting shaft 36 along the inclination angle adjusting surface 8 and 9 so as to adjust the inclination angle of the workpiece attaching surface 4.