PROBLEM TO BE SOLVED: To provide an ultrasonic wave propagating member which can be brought into close contact with a surface of an object to be inspected without a gap, and which makes post-treatment after the inspection unnecessary or simple. SOLUTION: The ultrasonic wave propagating member is used in contact with an object to be inspected, and the contact surface of the ultrasonic wave propagating member to the object to be inspected has a shape along the surface of the object to be inspected. Is. An embodiment including a hydrogel composed of water, a polymer and a mineral is preferable. [Selection diagram] None【課題】被検査対象の表面に隙間なく密着させることができると共に、検査後の後処理を不要もしくは簡便にできる超音波伝搬部材の提供。【解決手段】被検査対象に接触させて用いる超音波伝搬部材であって、前記超音波伝搬部材の被検査対象への接触面が、前記被検査対象表面に沿った形状を有する超音波伝搬部材である。水とポリマーと鉱物とから構成されるハイドロゲルを含む態様などが好ましい。【選択図】なし
