A surgical operation apparatus includes a handpiece to be held by an operator, and an apparatus main body to be connected with the handpiece, wherein the handpiece includes a high-frequency treatment unit to treat a living tissue by a high-frequency current, an ultrasonic treatment unit to treat a living tissue by an ultrasonic vibration, and a sensor unit to perform detection for calculation of an impedance of a living tissue, and the apparatus main body includes a high-frequency output module to activate the high-frequency treatment unit, an ultrasonic output module to activate the ultrasonic treatment unit, a sensor module to calculate the impedance of the living tissue based on a detection result obtained from the sensor unit, and a control module to automatically control at least the ultrasonic output module of the high-frequency output module and the ultrasonic output module in accordance with the impedance calculated by the sensor module so as to automatically adjust an output of at least the ultrasonic treatment unit of the high-frequency treatment unit and the ultrasonic treatment unit.
