PROBLEM TO BE SOLVED: To provide a micro-positioning device and a machine tool position posture correcting method exhibiting machine rigidity and capable of achieving positioning accuracy in nano-order.
SOLUTION: A driving element is constituted by two of piezo elements P1 and P2 arranged on a straight line along the expansion direction. Both ends of the piezo element P1 along the expansion direction are respectively fixed on a base member 1 and a movable member 2. Only one end of the piezo element P2 is fixed on the base member 1. An interval L is formed between the piezo element P2 and the movable member 2. When elongation displacement amounts of the piezo elements P1 and P2 are a1 and a2 respectively, the voltage applied to the piezo elements P1 and P2 is controlled as follows; a1+a2=a≥L. The movable member 2 can be positioned in a position within the maximum stroke (a) in nano-order. The driving element is arranged in the perpendicular direction, and the positioning device of 2-freedom or 6-freedom by including a rotating shaft can be achieved.
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