PROBLEM TO BE SOLVED: To provide an ultrasonic device which can sufficiently prevent occurrence of a virtual image in an ultrasonic image with a simple structure.SOLUTION: An ultrasonic wave is transmitted to an organism from a first surface of a substrate 22. At the same time, ultrasonic vibration is transmitted to a support member 27 from a second surface on the rear side of the first surface. The ultrasonic wave is reflected in accordance with acoustic impedance of a medium contacting an interface on a slope face 63 on the side opposite to a plane 29 receiving the substrate 22. At this time, since two adjacent ultrasonic transducer elements 33 have different transmission path length of the ultrasonic wave to the slope face 63, the ultrasonic vibration reaches the ultrasonic transducer elements 33 with a time difference. Therefore, the occurrence of a virtual image in an ultrasonic image can be efficiently prevented in accordance with the surface shape of the support member 27.【課題】簡単な構造で超音波画像内の虚像の出現を十分に防止することができる超音波デバイスを提供する。【解決手段】基板２２の第１面から生体に向かって超音波は発信される。同時に、第１面の裏側の第２面から超音波振動は支持部材２７に伝達される。基板２２を受ける平面２９とは反対側の斜面６３では界面に接する媒体の音響インピーダンスに応じて超音波は反射する。このとき、隣り合う２つの超音波トランスデューサー素子３３では斜面６３まで超音波の伝達経路の長さが相違することから、超音波振動は時間差で超音波トランスデューサー素子３３に辿り着く。こうして支持部材２７の表面形状に応じて超音波画像内の虚像の出現は効果的に防止される。【選択図】図９
