An ultrasound diagnostic system includes a connection section for detachably connecting an ultrasound device mounted with a capacitive micromachined ultrasonic transducer (C-MUT) and a transmission signal generation section that generates a transmission signal using a connector provided in the ultrasound device and a connector receiver provided in the ultrasound observation apparatus, a discharge section for discharging the charge applied to the C-MUT, a lock mechanism that keeps the connection section in a locked state and a released state and a switching section arranged on a signal line between the C-MUT and the ultrasound observation apparatus, wherein when a predetermined mounting state is set, the C-MUT is electrically connected to the transmission signal generation section via the signal line, and through switching by the switching section after an operation of unlocking the lock mechanism, a state is set in which the charge of the C-MUT of the ultrasound device is discharged.
