To construct a three-dimensional image artifacts due to variations in the pressure force is reduced, the ultrasound probe 12 to the ultrasound transmitted and received between the object 10 and is brought into contact with the subject 10, an ultrasonic transducer compression force applied to the object 10 by 12 children, and is changed in the process of fault location for transmitting and receiving ultrasonic waves to the subject 10 is moved in the minor axis direction, and transmit and receive periodically an ultrasonic wave to the subject 10 Te, RF signal frame of the two measuring time transmitting unit 14 for measuring the RF signal frame data of the fault location by receiving processes the reflected echo signals from the subject 10, a receiver 16, is measured by the receiver 16 is different an elastic image forming section 34 on the basis of the displacement and the displacement measuring unit 30 on the basis of the data, sequentially obtained a displacement of the biological tissue of the fault location, and sequentially obtained by the displacement measuring unit 30, which constitute sequentially elasticity image of the body tissue, and a cumulative displacement by accumulating the displacement of the living tissue according to a configured elastic image sequentially by the elastic image constructing unit 34, and to the selected cumulative displacement selects the elasticity image in the set range from the elastic images of a plurality of To configure an ultrasonic diagnostic apparatus comprising and a 3-dimensional image constructing unit 24 constituting a 3-dimensional elastic image based on the volume data to generate volume data of the elastic image, were generated.圧迫力の変動によるアーチファクトが軽減された3次元画像を構成するために、被検体10に当接させて被検体10との間で超音波送受信する超音波探触子12と、超音波探触子12により被検体10に加える圧迫力が変化され、かつ、被検体10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、被検体10に超音波を周期的に送受信して、被検体10からの反射エコー信号を受信処理して断層位置のRF信号フレームデータを計測する送信部14、受信部16と、受信部16により計測される計測時間が異なる2つのRF信号フレームデータに基づいて、断層位置の生体組織の変位を順次求める変位計測部30と、変位計測部30により
