An ultrasonic treatment apparatus includes an ultrasonic instrument, a fluid irrigation unit, a fluid suction unit, an ultrasonic driving control unit, and an irrigation/suction control unit. The ultrasonic instrument treats a living-body tissue through ultrasonic vibrations. The fluid irrigation unit supplies a cooling fluid for cooling the ultrasonic instrument to the ultrasonic instrument. The fluid suction unit sucks a cooling fluid irrigated by the fluid irrigation unit to the ultrasonic instrument. The ultrasonic driving control unit controls the driving of ultrasonic vibrations of the ultrasonic instrument. The irrigation/suction control unit sequentially controls the driving of the fluid irrigation unit and the driving of the fluid suction unit in accordance with the output of the ultrasonic driving control unit.
