PROBLEM TO BE SOLVED: To provide an operation apparatus that can make its operation easy and safe. SOLUTION: The operation apparatus 1 of this invention is equipped with an electrode 22, a hand-piece 2 provided with the electrode 22, a high-frequency electric current generation device 3 which supplies the electrode 22 with a high frequency electric current, an ultrasonic wave generation device 4 which supplies the electrode 22 with ultrasonic wave oscillations, and a means for control which controls a ratio of an output of a high-frequency electric current from the high-frequency wave generation device 3 to ultrasonic wave oscillations from the ultrasonic wave generation device 4. Thus, when each output is controlled, since it is not necessary to execute a control operation for each output separately, the apparatus allows an easy and safe operation thereof when medical operations are executed.
