PROBLEM TO BE SOLVED: To provide an ultrasonic treatment apparatus capable of stably generating exothermic energy necessary for treating an affected part irrespective of a density or a kind of a tissue.SOLUTION: An ultrasonic treatment apparatus 1 includes: a converged ultrasonic vibrator 2 for irradiating a converged ultrasonic wave a probe 3 for irradiating an ultrasonic wave for measurement to a biological tissue C through which the converged ultrasonic wave passes and measuring the intensity and a control part 9 for controlling the output intensity of the converged ultrasonic wave irradiated by the converged ultrasonic vibrator 2 based on a distance between two measurement points O and Q through which the ultrasonic wave for measurement irradiated by the probe 3 passes, and the intensity variation of the ultrasonic wave for measurement by the passing between the measurement points O and Q.
