To improve reliability of ultrasonic elasticity measurement in a region of interest with small power consumption.SOLUTION: In an ultrasonic diagnostic device which causes a probe to transmit a push wave for an ultrasonic beam to focus in a subject, and detects a propagation velocity of a shear wave generated by an acoustic radiation pressure of the push wave, a push wave pulse transmission unit 1041 supplies a push wave pulse pppn of a predetermined time length for which a predetermined phase is set to each of a plurality of transmission vibrators Px selected from a plurality of vibrators 101a a plurality of times so that a plurality of transmission vibrators Tx are caused to transmit a plurality of push waves ppn that focus on each of a plurality of transmission focal points FPn with different position in a depth direction in the subject in such a manner that an interval ΔFzn between adjacent transmission focal points FPn is larger in a deep part of the subject and smaller in a shallow part of the subject, and a ratio of a depth Fzn of the transmission focal point to a string length Px of the plurality of transmission vibrators is larger in the deep part of the subject and smaller in the shallow part of the subject.SELECTED DRAWING: Figure 5【課題】少ない消費電力にて関心領域内の超音波弾性計測の信頼度を向上する。【解決手段】プローブに被検体内に超音波ビームが集束するプッシュ波を送信させ、プッシュ波の音響放射圧により生じたせん断波の伝播速度を検出する超音波診断装置において、プッシュ波パルス送信部１０４１は、複数の振動子１０１ａから選択される複数の送信振動子Ｐｘそれぞれに対し所定の位相が設定された所定時間長のプッシュ波パルスｐｐｐｎを複数回供給することにより、複数の送信振動子Ｔｘに被検体内の深さ方向における位置が異なる複数の送信焦点ＦＰｎそれぞれに集束する複数のプッシュ波ｐｐｎを、隣接する送信焦点ＦＰｎ間の間隔ΔＦｚｎが被検体の深部ほど大きく浅部ほど小さく、かつ、複数の送信振動子の列長Ｐｘに対する送信焦点の深さＦｚｎの比率が被検体の深部ほど大きく浅部ほど小さく送信させる。【選択図】図５
