A machine tool includes a spindle having a tip on which a tool is mounted, a moving portion configured to move the spindle, on which a tool is mounted, toward a peripheral edge of a master workpiece or away from the peripheral edge along a reference path on an outer peripheral side or an inner peripheral side of the master workpiece, a first detection unit configured to detect contact with a peripheral edge of the tool, an acquisition unit configured to acquire coordinates of the spindle each time the first detection unit detects the contact, and a first generation unit configured to generate a first machining path based on a plurality of coordinates detected by the acquisition unit.