It makes the ultrasonic probe and the aforementioned ultrasonic probe in the object organization of the suffering inspection body press, removing 1 opposites than frame data acquisition expedient and aforementioned plural RF signal frame data which acquire plural RF signal frame data time serially with the process where compressed state of the aforementioned object organization changes, calculating in the distortion or modulus of elasticity of each position of the aforementioned object organization, adding elastic information operational expedient and aforementioned plural elastic frame data which form plural elastic frame data, it indicates elastic picture constitution expedient and the aforementioned elastic picture which form the elastic picture the indication which is indicatedIn the ultrasonic diagnostic device which has expedient, The appraisal expedient which appraises the reliability of plural elastic frame data which become the object of the aforementioned addition on the basis of the aforementioned pressure is had.超音波探触子と、前記超音波探触子を被検体の対象組織に圧迫させ、前記対象組織の圧縮状態が変化する過程で複数個のRF信号フレームデータを時系列的に取得するフレームデータ取得手段と、前記複数個のRF信号フレームデータより1対を取り出して、前記対象組織の各位置の歪み又は弾性率に計算して複数個の弾性フレームデータを生成する弾性情報演算手段と、前記複数個の弾性フレームデータを加算して弾性画像を生成する弾性画像構成手段と、前記弾性画像を表示する表示する表示手段を備えた超音波診断装置において、前記加算の対象となる複数個の弾性フレームデータの信頼性を前記圧迫の程度に基づいて評価する評価手段を備える。
