An ultrasound operation apparatus 21 includes an ultrasound transducer Ib a drive section 5 that drives the ultrasound transducer Ib using a drive signal a probe 2 that has a proximal end section in which the ultrasound transducer Ib is provided and a distal end section to which ultrasound vibrations are transmitted, and that performs treatment for living tissue by using ultrasound vibrations at the distal end section a resonance frequency tracking section 37 that drives so as to cause ultrasound vibrations to be generated at a resonance frequency a detection section 38 having a function of a filter section 39 that detects a frequency component signal of a frequency component other than a resonance frequency of the drive signal and a cavitation suppression control section 40a that controls so as to suppress or eliminate cavitations according to the detection result.
