To provide an ultrasonic operation apparatus capable of increasing the crushing power if an operator intends when encountering with a hard crystal core, etc. and allowing a smooth operation.

The ultrasonic operation apparatus comprises an ultrasonic emulsification means for applying ultrasonic vibrations to an ultrasonic tip and crushing/emulsifying an intraocular tissue, a suction means for sucking the emulsified intraocular tissue, a detection means for detecting the closed state of the ultrasonic tip, and a foot switch with a foot pedal for outputting a signal according to the operation position of the foot pedal. The ultrasonic operation device controls the ultrasonic vibration at least either of the pulse duty ratio of the pulse vibration by the ultrasonic emulsification means or the ultrasonic power based on the signal outputted from the foot switch and the result of detection of the detection means.