The grasping treatment device stops the output of the vibration generation power based on the detection of the target peak, or the incision performance by the ultrasonic vibration in the treatment portion is higher than that in the first ultrasonic output mode before the peak detection. An ultrasonic control unit is provided that outputs vibration generated power in a second ultrasonic output mode that becomes smaller. Based on the detection of the target peak, the grasping treatment device has a higher incision performance due to a high-frequency current flowing between the probe electrode portion and the jaw electrode portion than in the first high-frequency output mode before the peak detection. A high-frequency control unit that outputs high-frequency power in two high-frequency output modes；把持処置装置は、対象ピークの検出に基づいて、振動発生電力の出力を停止する、又は、ピーク検出時以前の第１の超音波出力モードに比べて処置部での超音波振動による切開性能が小さくなる第２の超音波出力モードで振動発生電力を出力させる超音波制御部を備える。前記把持処置装置は、対象ピークの検出に基づいて、前記ピーク検出時以前の第１の高周波出力モードに比べてプローブ電極部とジョー電極部との間で流れる高周波電流による切開性能が大きくなる第２の高周波出力モードで、高周波電力を出力させる高周波制御部を備える。
