Signal-noise ratio of reception system is improved, the ultrasonic diagnostic device of high sensitivity is offered. In the ultrasonic probe it processes the signal which is output from the transmission section 20 which supplies the drive signal 10 which sends and receives the ultra wave with the inspection bodies and the ultrasonic probe and ultrasonic probe 10, it possesses with the reception section 60 which calculates the information of the diagnosis which relates to the suffering inspection body. Ultrasonic probe 10 the probe for reception where reception sensitivity changes according to the size of the bias voltage which is impressed (the oscillator) has 10B. Reception section 60 the bias voltage signal where amplitude is modulated the probe for reception (the oscillator) has the irregularity bias amplifier 24 which is impressed in 10B. Because of this, for example with reception process of the oscillator for reception, in the ultrasonic heliogram fixed recovery processing (, phasing processing and Doppler recovery) it is possible to administer.受信系の信号対雑音比を改善し、高感度の超音波診断装置を提供する。検体との間で超音波を送受する超音波探触子10と、超音波探触子に駆動信号を供給する送信部20と、超音波探触子10から出力される信号を処理し、被検体に係る診断情報を算出する受信部60とを有する。超音波探触子10は、印加されるバイアス電圧の大きさに応じて受信感度が変化する受信用探触子(振動子)10Bを備える。受信部60は、振幅が変調されたバイアス電圧信号を受信用探触子(振動子)10Bに印加する変調バイアス増幅部24を備える。これにより、受信用振動子の受信工程で、超音波反射信号に一定の復調処理(例えば、整相処理やドプラ復調)を施すことができる。
