An ultrasound operation apparatus comprises: an ultrasound transducer； a driving section that drives the ultrasound transducer by a drive signal； a probe having a proximal end section provided with the ultrasound transducer and a distal end section to which ultrasound oscillation is transmitted, the probe performing a treatment on a living tissue using ultrasound oscillation at the distal end section； a detecting section that detects, from a drive signal, a physical quantity which varies due to cavitation generated by ultrasound oscillation of the distal end section； and an output control section that controls an output of the driving section in accordance with the detected physical quantity.
