The energy control device (3) comprises an ultrasonic transducer (13) that generates ultrasonic vibration when power is supplied, and an end effector (7) that performs treatment using the ultrasonic vibration generated by the ultrasonic transducer. Power to the ultrasonic treatment tool (2). The energy control device (3) comprises a first power supply (51) for supplying power to the ultrasonic transducer (13), and a timer unit (41) for measuring the output duration time of the first power supply (51)； A monitoring unit (42) for monitoring characteristic parameters, a threshold setting unit (43) for setting a time threshold based on the characteristic parameters, and an output control unit (44). The output control unit (44) causes the first power supply to stop outputting power when the output duration time exceeds the time threshold.
