A high frequency surgery apparatus includes a high frequency current generation section that generates a high frequency current to be transmitted to a living tissue to be operated on, a high frequency probe that transmits the high frequency current to the living tissue to perform treatment with the high frequency current, a time measuring section that measures an output time of the high frequency current, an impedance detection section that detects an electric impedance of the living tissue and an output control section that performs control so as to stop the output of the high frequency current upon detecting that the output time exceeds a first threshold and detecting that the electric impedance value exceeds a second threshold.
