To provide a three-dimensional ultrasonic probe whose transmission and reception circuit scale is small and which can perform endless rotation scan.SOLUTION: The three-dimensional ultrasonic probe comprises: a concentric array vibrator composed of a plurality of concentrically arranged ring-shaped vibrators fixed in a sealed container filled with an acoustic medium； and an ultrasonic shielding plate which has an ultrasonic window. Electronic scanning is performed in a moving radial direction of the concentric array vibrator, and the ultrasonic shielding plate having the acoustic window is rotated in an angular direction in the closed container, thereby moving an electronic scanning cross section and collecting a three-dimensional image.SELECTED DRAWING: Figure 1【課題】送受信回路規模が小さく、エンドレスな回転スキャンができる３次元超音波プローブ。【解決手段】音響媒体を満たした密閉容器内に固定した同心状に配置された複数のリング状振動子からなる同心状アレイ振動子と、超音波窓を有する超音波遮蔽板からなり、同心状アレイ振動子の動径方向には電子走査を行い、角度方向には音響窓を有する超音波遮蔽板が密閉容器内において回転することで、電子走査断面を移動し3次元画像を収集する。【選択図】 図１
