An ultrasound diagnostic apparatus includes: an ultrasound probe； a transmission and reception unit that transmits an ultrasound beam from the ultrasound probe toward a subject, receives an ultrasound beam reflected from the subject, and processes a received signal output from the ultrasound probe to generate received data； a complex data generation unit that generates first complex data including amplitude information and phase information by orthogonally detecting the received data generated by the transmission and reception unit using a first center frequency and a first cutoff frequency and generates second complex data by orthogonally detecting the same data as the received data using a second cutoff frequency and a second center frequency lower than the first center frequency； a B-mode processing unit that generates a B-mode image using amplitude information of at least one of the first complex data or the second complex data； a phase difference calculation unit that calculates a first phase difference between frames using phase information of the first complex data and calculates a second phase difference between frames using phase information of the second complex data； a phase difference correction unit that corrects the first phase difference using the second phase difference； and a displacement amount calculation unit that calculates an amount of displacement of a measurement target tissue of the subject using the corrected first phase difference.
