ULTRASONIC VIBRATION APPLICATION TOOL, TRAVELING WAVE GENERATION DEVICE, AND ULTRASONIC MACHINING DEVICE

[Problem] To provide an ultrasonic vibration application tool comprising a Langevin ultrasonic transducer that is incorporated into an ultrasonic machining device and is suitable for generating circular traveling waves. [Solution] An ultrasonic vibration application tool including: a cylindrical housing having a downwardly widening contact surface on the lower part of the inner peripheral surface,and provided with a threaded surface on the lower part of the outer peripheral surface; a Langevin ultrasonic transducer configured such that a polarization-treated piezoelectric element is bolted ina sandwiched state between a front mass, the upper part which is provided with a flange part having a contact surface fitted together with the contact surface of the housing, and a rear mass disposedabove the front mass; and a ring-shaped counter weight, the upper part of the inner peripheral surface of which is provided with a threaded surface into which the threaded surface in the lower part of the outer peripheral surf