PROBLEM TO BE SOLVED: To provide an ultrasonic treatment device capable of performing comfortable treatment by accurately measuring the temperature of an ultrasonic transducer. An ultrasonic oscillator, a cover to which the ultrasonic oscillator is attached, a casing to which the cover is attached, a first temperature sensor that measures the temperature of the ultrasonic oscillator, and a substrate that holds the first temperature sensor. A bottom surface portion provided between the ultrasonic transducer and the first temperature sensor, having an opening in a region where the ultrasonic transducer and the first temperature sensor face each other, and electrically connected to the cover； And a first electrode connecting the bottom surface portion and a second electrode connecting the substrate and the ultrasonic transducer. [Selection diagram] FIG.【課題】超音波振動子の温度を正確に測定することで、快適な治療を行うことが可能な超音波治療器を提供する。【解決手段】超音波振動子と、超音波振動子が取り付けられるカバーと、カバーが取り付けられるケーシングと、超音波振動子の温度を測定する第１温度センサと、第１温度センサを保持する基板と、超音波振動子と第１温度センサとの間に設けられ、超音波振動子と第１温度センサが対向する領域に開口を有するとともに、カバーと電気的に接続された底面部と、基板と底面部を接続する第１電極と、基板と超音波振動子を接続する第２電極と、を備える。【選択図】図２
