A machine tool includes a displacement measuring unit to measure the displacement of a workpiece center-to-blade tip distance which is the distance between a center equivalent position of a workpiece support surface of a workpiece support unit and a blade tip equivalent position of a tool support unit in a direction perpendicular or substantially perpendicular to a spindle axis. The displacement measuring unit measures the displacement by measuring the displacement of a continuous path between the center equivalent position of the workpiece support unit and the blade tip equivalent position and excluding a processing movement region. The displacement measuring unit includes workpiece side and tool side linear position detecting units. A measured value of the displacement measuring unit is used in correcting an X-axis command value.