To suppress arrival of a sound from an external part to a sensor part, in a biological sensor.SOLUTION: A biological sensor 1 comprises: a housing 2 comprising an external surface 11 in contact with a biological body H, and a recess 12 which becomes dent from the external surface and sealed from the external part in a state in which the external surface is in contact with the biological body, and for blocking a sound； a sensor part 3 which is provided inside the recess in view from the external surface side of the housing, enters the recess in a state of the external surface of the housing is in contact with the biological body, and detects vibration of the biological body； and an elastic part 4 which connects the sensor part to the housing in a manner of capable of elastically displacing in a direction where the recess is opened, and pushes the sensor part against the biological body in a state in which the external surface of the housing is in contact with the biological body.SELECTED DRAWING: Figure 1【課題】生体センサにおいて、外部からの音がセンサ部に到達することを抑制できるようにする。【解決手段】生体Ｈに接する外面１１、及び、外面から窪んで形成されると共に外面が生体に接した状態で外部に対して密閉される凹部１２を有し、音を遮蔽する筐体２と、筐体の外面側から見て凹部の内側に配され、少なくとも筐体の外面が生体に接した状態で凹部に入り込み、生体の振動を検出するセンサ部３と、センサ部を筐体に対して凹部が開口する方向に弾性的に変位可能に接続し、筐体の外面が生体に接した状態でセンサ部を生体に押し付ける弾性部４と、を備える生体センサ１を提供する。【選択図】図１
