ULTRASONIC GENERATOR MANUFACTURING METHOD AND ULTRASONIC GENERATOR ASSEMBLY SYSTEM

A manufacturing method of an ultrasonic generating device includes applying a compressive force to an attachment unit toward a first axial direction while a first end of a bolt-shaped member is a free end and a second end is fixed and thereby expanding the bolt-shaped member by a first elastic force of the contracted attachment unit. The manufacturing method includes attaching a fastening member to a bar portion of the bolt-shaped member in a balanced condition in which a second elastic force of the expanded bolt-shaped member and the first elastic force are in balance to maintain the balanced condition.