A support structure 10 for an ultrasonic resonator supports an ultrasonic resonator 16, in which first and second boosters 14, 15 are coaxially secured at the respective axial sides of an ultrasonic horn 13 to which a machining tool 12 is attached, the ultrasonic resonator 16 being supported at both ends so as to be capable of rotating relative to a holder 17. The holder 17 has a roller bearing mechanism 18 that rotatably supports the first booster 14 side of the ultrasonic resonator 16, and a gas bearing mechanism 19 that rotatably supports the second booster 15 side of the ultrasonic resonator 16.
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