A surgical apparatus includes: a treatment section treating a living tissue an energy generation section generating energy for providing ultrasound vibration or high-frequency current to the treatment section a probe provided in the treatment section, for performing the ultrasound vibration a liquid feeding unit supplying a liquid a liquid feeding conduit feeding the liquid a liquid feeding port, provided in the treatment section, for feeding the liquid toward the probe to feed the liquid to between the living tissue and the treatment section a liquid feeding unit supplying the liquid to the liquid feeding conduit an impedance detection section detecting an impedance of the living tissue is in contact with the treatment section and a control section that controls the liquid feeding unit, after the stoppage of the output of the energy, so that as the impedance is larger, a predetermined period of time or a predetermined amount increases.
