Provided is an ultrasonic diagnostic apparatus which performs velocity measurement with reduced wavefront characteristics accompanying propagation of a shear wave and reduced influence of scattering. The probe 11 and the ultrasonic transmitter / receiver 13 transmit a burst wave, which is a first ultrasonic wave, to the subject to give a radiation pressure, and the radiation pressure is applied to the subject accompanying the propagation of the shear wave generated in the subject Is detected by transmitting and receiving a track pulse wave as a second ultrasonic wave to and from the subject. Using the received data from the ultrasonic transceiver 13, the elasticity evaluating unit 17 of the control unit 12 calculates a first track pulse wave having a predetermined angle ( 0) with respect to the depth direction of the subject, Measuring the first arrival time of the shear wave at the depth of the shear wave and the second arrival time of the shear wave at the second depth and based on the difference between the first arrival time and the second arrival time, Calculates the propagation velocity of the wave, and displays the elasticity information of the subject on the display unit 15.せん断波の伝搬に伴う波面特性や散乱の影響を軽減した速度計測を行う超音波診断装置を提供する。探触子11、超音波送受信部13から第1の超音波であるバースト波を被検体に送信して放射圧を与え、この放射圧によって被検体内で生じたせん断波の伝搬に伴う被検体中の媒質の変位を、第2の超音波であるトラックパルス波を被検体に送受信することで検出する。超音波送受信部13からの受信データを用いて制御部12の弾性評価部17は、被検体の深度方向に対して所定の角度θ(≠0)を有する単一のトラックパルス波によって、第1の深さにおけるせん断波の第1の到来時間と、第2の深さにおけるせん断波の第2の到来時間とを計測し、第1の到来時間と第2の到来時間の差に基づいてせん断波の伝搬速度を算出し、被検体の弾性情報を表示部15に表示する。
