As for this invention, without depending on the preciseness and stability of blood pressure measurement, furthermore also without doing blood pressure measurement, it designates that it offers the ultrasonic diagnostic device whose it is possible to do the spatial distribution indication of the elastic quality which it stabilizes in every beat as purpose. In the ultrasonic diagnostic device of this invention, it is transmitted from ultrasonic probe 13, the ultrasonic reflected wave which is reflected at the time of organism organizing, reception section 15, delay time control section 16, phase detection section 17, passing filter section 18, is input into arithmetic logical unit 19. As for arithmetic logical unit 19, the relative elastic quality which is the elastic quality which is formalized on the basis of the phase detection signal which is obtained in phase detection section 17, by the elastic quality of the optional standard territory of organism organization is calculated. Distribution of the relative elastic quality which the arithmetic logical unit calculates is indicated in indicatory department 21.本発明は、血圧測定の正確性や安定性に依存せずに、さらには血圧測定を行わなくとも、拍毎に安定した弾性特性の空間分布表示を行うことが可能な超音波診断装置を提供することを目的とする。本発明の超音波診断装置において、超音波プローブ13から送信され、生体組織において反射した超音波反射波は、受信部15、遅延時間制御部16、位相検波部17、フィルタ部18を経て、演算部19に入力される。演算部19は、位相検波部17で得られた位相検波信号に基づき、生体組織の任意の基準領域の弾性特性によって正規化された弾性特性である相対弾性特性を演算する。演算部が演算した相対弾性特性の分布は、表示部21に表示される。
