An ultrasonic treatment device includes a transmitting connection section connecting a proximal-side vibration transmitting section to a distal-side vibration transmitting section at an anti-node position of an ultrasonic vibration. The ultrasonic treatment device includes a detecting section detecting a coupled state in which a treatment unit is coupled with a vibrator unit or a non-coupled state in which the treatment unit is not coupled with the vibrator unit, and a supply control section controlling a supply state of a generating electric power from an electric power supply section based on a detection result of the detecting section when a first vibration generating operation is input.