The ultrasonic diagnostic apparatus includes: a transducer； a driving signal generation unit configured to generate a driving signal； and a transmission circuit configured to output a driving current corresponding to the driving signal, so as to drive the transducer, the transmission circuit includes: a transducer driving unit formed by a current mirror with a low voltage transistor and a high voltage transistor, the high voltage transistor being connected with the transducer, and a current source configured to supply an operation current corresponding to the driving signal to the low voltage transistor of the transducer driving unit, the driving signal generation unit includes: a transmission circuit driving unit replica that has a configuration same as that of the transducer driving unit, and a feedback control unit to detect a current flowing through a high voltage transistor of the transmission circuit driving unit replica, and to control the current to be constant.
