The present invention despite a simple structure, sound waves, providing broadband sensor capable of detecting a pulse wave or the like efficiently. And An insulating substrate 1, a piezoelectric element 2 mounted on the surface of the insulating substrate 1, at least the piezoelectric element 2 facing the portion attached to surround the piezoelectric element 2 to the surface of the insulating substrate 1 It includes a cylindrical member 3 having an opening 4A (4B), and an output means 5 for taking out an output of the piezoelectric element 2, a. Also, broadband sensor is used is brought into contact with the body surface 10, it is brought into contact with the opening of the surrounding member on the body 10, which comprises using to form an enclosed cavity within the enclosure member.FIELD 1【課題】簡単な構成にも拘わらず、音波、脈波等を効率よく検知することができる広帯域センサを提供する。【解決手段】絶縁基板1と、絶縁基板1の表面に搭載された圧電素子2と、絶縁基板1の表面に圧電素子2を囲んで取り付けられ少なくとも圧電素子2と対向する部分に開口4A(4B)を有する筒状部材3と、圧電素子2の出力を取り出す出力手段5と、を備える。また、広帯域センサは、体表10に当接させて用いられ、体表10に囲い部材の開口を当接させ、囲い部材内に密閉キャビティを形成して用いることを特徴とする。【選択図】図1
