PROBLEM TO BE SOLVED: To provide an ultrasound diagnostic device capable of performing more accurate tissue property analysis.SOLUTION: An ultrasound diagnostic device comprises: an ultrasound probe for acquiring echo signals by transmitting/receiving ultrasound to/from an analyte a display unit on which an ultrasound image based on addition data obtained by performing weighting addition on a plurality of frames of data acquired from the echo signals is displayed a dissemination calculation unit for calculating a variation coefficient CV of the addition data for each frame a tissue property analysis unit for performing tissue property analysis of a biological tissue of the analyte in the ultrasound image, on the basis of the addition data and a frame determination unit for determining a frame of the ultrasound image which is a target of the tissue property analysis by the tissue property analysis unit, on the basis of the variation coefficient CV.
