An ultrasound diagnostic device that transmits a push pulse into a subject and detects a shear wave propagating to adjacent tissue by repeating transmission of ultrasound to the subject and reception of reflected ultrasound from the subject, including a displacement detector that obtains reception signals in a time series by transmitting ultrasound to the subject and receiving reflected ultrasound from the subject, subsequent to transmission of the push pulse, and detects a displacement amount of the tissue inside the subject at each point in time at which the reception signals are respectively obtained； a wavefront extractor that extracts, based on the displacement amount of the tissue at each of the points in time, a wavefront of the shear wave at the corresponding point in time； and a wavefront image processor that generates a wavefront image that indicates a wavefront of the shear wave at each of the points in time.
