PROBLEM TO BE SOLVED: To provide an ultrasonic device capable of knowing a factor that reduces the reliability of a measurement value regarding elasticity of a living tissue. An ultrasonic diagnostic apparatus includes a measurement value calculation function 535 for calculating a measurement value relating to elasticity of the biological tissue based on an echo signal of a detection ultrasonic pulse, and an echo signal of the detection ultrasonic pulse. For each of a plurality of factors that impair the reliability of the measured value, an index value calculation function 536 that calculates an index value indicating the degree of reliability of the measured value, and at least one of which the degree of reliability does not satisfy the required standard. And a control circuit that executes a notification function that notifies a factor corresponding to one index value. [Selection diagram] Fig. 3【課題】生体組織の弾性に関する計測値の信頼性を低くしている要因を知ることができる超音波装置を提供する。【解決手段】超音波診断装置は、検出用超音波パルスのエコー信号に基づいて、前記生体組織の弾性に関する計測値を算出する計測値算出機能５３５と、 検出用超音波パルスのエコー信号に基づいて、計測値の信頼性を損なう複数の要因の各々について、計測値に対する信頼性の程度を示す指標値を算出する指標値算出機能５３６と、信頼性の程度が所要の基準を満たさない少なくとも一つの指標値に対応する要因を報知する報知機能と、を実行する制御回路を備える。【選択図】図３
