PROBLEM TO BE SOLVED: To provide a thin ultrasonic device.SOLUTION: An ultrasonic device includes: a first substrate 2 having installed thereon an ultrasonic element 3 for transmitting ultrasonic waves in a first direction 6 and a second direction 7 opposite to the first direction 6 a second substrate 9 for attenuating the ultrasonic wave transmitted in the second direction 7 and a switching unit 8 for switching the connection between the first substrate 2 and the second substrate 9 to one of a contact state and a non-contact state.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2018,JPO&INPIT【課題】薄い超音波デバイスを提供する。【解決手段】超音波を第1方向6と第1方向6と逆向きの第2方向7とに送信する超音波素子3が設置された第1基板2と、第2方向7に送信される超音波を減衰する第2基板9と、第1基板2と第2基板9とを接触状態と非接触状態との一方に切り換える切替部8と、を備える。【選択図】図5
