As well as transmitted to the subject the ultrasound, the ultrasonic probe including plural ultrasonic transducers to output an ultrasound detection signal by receiving the ultrasonic waves reflected by the analyte, the present invention, the subject To provide an ultrasonic diagnostic apparatus comprising: a region-of-interest setting unit that sets a region of interest of the inner, and a variation measurement section for measuring the attenuation variation or variation in sound speed of the ultrasound in the region of interest.本願発明は、超音波を被検体に送信するとともに、該被検体によって反射される超音波を受信して超音波検出信号を出力する複数の超音波トランスデューサを含む超音波探触子と、被検体内の着目領域を設定する着目領域設定部と、着目領域における超音波の音速バラツキまたは減衰バラツキを計測するバラツキ計測部と、を備える超音波診断装置を提供する。
