An ultrasound diagnostic apparatus capable of obtaining a high-quality ultrasound image while suppressing the temperature rise in an ultrasound probe. The ultrasound probe includes receive amplification units including amplifiers for amplifying reception signals outputted from a transducer array and a power supply unit for supplying bias current to the amplifiers. The power supply unit changes the bias current it supplies to the amplifiers according to the depth of a reflection position of ultrasonic echo.
