Ultrasonic diagnostic apparatus according to the present invention, and changes in the ultrasonic probe for ultrasonic wave transmission and reception to and from the examinee is brought into contact with the object, the compression force applied to the object by the ultrasonic probe It is, in the process of fault location and transmits and receives ultrasonic waves to the subject is moved in the minor axis direction, can be sent and received periodically ultrasonic wave to the subject, and receives the reflected echo signals from the subject two RF signals to a receiving unit for measuring the RF signal frame data of the fault location by processing, the difference between the measurement time is selected from RF signal frame data of a plurality of measured sequentially by the receiving unit belonging to the set range a displacement measuring unit on the basis of the frame data sequentially generates displacement frame data by obtaining the displacement of the living tissue of the fault location, based on the displacement frame data are sequentially generated by the displacement position measuring unit, biometric of the fault position and an elastic information calculating unit for sequentially generating elastic frame data by obtaining the elasticity information of the tissue, and an elastic image forming section on the basis of the elastic frame data are sequentially generated by the elastic information calculating unit, configured sequentially elasticity image .本発明の超音波診断装置は、被検体に当接させて前記被検体との間で超音波送受信する超音波探触子と、前記超音波探触子により前記被検体に加える圧迫力が変化され、且つ、前記被検体に超音波を送受信する断層位置が短軸方向に移動される過程で、前記被検体に超音波を周期的に送受信して、前記被検体からの反射エコー信号を受信処理して前記断層位置のRF信号フレームデータを計測する送受信部と、前記送受信部により順次計測される複数のRF信号フレームデータから選択される計測時間の差が設定範囲内に属する2つのRF信号フレームデータに基づいて、前記断層位置の生体組織の変位を求めて変位フレームデータを順次生成する変位計測部と、該変位計測部により順次生成される変位フレームデータに基づいて、前記断層位置の生体組織の弾性情報を求めて弾性フレームデータを順次生成する弾性情報演算部と、該弾性情報演算部により順次生成される弾性フレームデータに基づいて、弾性画像を順次構成する弾性画像構成部とを備える。
