PROBLEM TO BE SOLVED: To highly improve definition of a semiconductor sensor by enlarging a sensing area of an ultrasonic probe.SOLUTION: An ultrasonic diagnostic apparatus includes an ultrasonic probe comprising: a CMUT (Capacitive Micro-machined Ultrasonic Transducer) chip 2a in which drive electrodes 3e-3j and the like are disposed on a rectangular CMUT element part 21 into a grid shape； and a CMUT chip 2b in which drive electrodes 3p-3u and the like are disposed on the rectangular CMUT element part 21 into a grid shape, and that is located adjacent to the CMUT chip 2a, where intervals between the drive electrodes 3p-3u and the drive electrodes 3e-3j of the CMUT chip 2a, adjacent to the drive electrodes 3p-3u are electrically connected respectively by bonding wires 4f-4i and the like.SELECTED DRAWING: Figure 7【課題】超音波探触子のセンシング面積を大きくして高精細化する。【解決手段】超音波診断装置は、駆動電極３ｅ～３ｊなどが矩形状のＣＭＵＴ素子部２１にグリッド状に配列されたＣＭＵＴチップ２ａと、駆動電極３ｐ～３ｕなどが矩形状のＣＭＵＴ素子部２１にグリッド状に配列され、ＣＭＵＴチップ２ａに隣接し、かつ駆動電極３ｐ～３ｕに隣接するＣＭＵＴチップ２ａの駆動電極３ｅ～３ｊとの間がそれぞれボンディングワイヤ４ｆ～４ｉなどで電気的に接続されたＣＭＵＴチップ２ｂとを含んで構成される超音波探触子を備える。【選択図】図７
