Ultrasound diagnostic system and a diagnostic ultrasound system that includes a transmission signal generator for generating an ultrasound device equipped with a capacitive transducer, the transmission signal for driving a capacitive transducer and placed on the signal line between the discharge portions for discharging a connecting portion for detachably connecting the charge applied to the capacitive transducer, the ultrasound observation apparatus and the capacitive transducer and electrically connected to the transmission signal generating unit capacitive transducer via a signal line when it is provided, and a switching section for the ultrasound equipment is set in the mounted state of the predetermined diagnostic ultrasound system The and to switch the switching unit to be a state of discharge by the discharging unit charges of the capacitive transducer when the ultrasonic device is removed from the ultrasound observation apparatus.超音波診断システムは、静電容量型振動子を搭載した超音波機器と、静電容量型振動子を駆動するための送信信号を発生する送信信号発生部を備えた超音波観測装置と、を着脱自在に接続するための接続部と、静電容量型振動子に印加された電荷を放電するための放電部と、静電容量型振動子と超音波観測装置との間の信号線上に配置した切替部と、を具備し、超音波機器が超音波観測装置に所定の装着状態に設定された場合には信号線を介して静電容量型振動子を送信信号発生部に電気的に接続し、超音波機器が超音波観測装置から外される場合には静電容量型振動子の電荷を前記放電部により放電する状態になるように切替部の切替を行う。
