Disclosed is an ultrasound diagnostic imaging apparatus including an ultrasound probe which outputs transmission ultrasound waves toward a subject by a driving signal and which outputs received signals by receiving reflection ultrasound waves from the subject and a transmitting unit which generates the transmission ultrasound waves by the ultrasound probe by outputting the driving signal, and the transmitting unit generates the driving signal of square wave having a waveform in which a standard pulse signal where a pulse cycle is 2 T is combined with two first pulse signals of same polarity having a pulse width A (A
