The present invention provides a biological vibration sensor having a high S / N ratio. The biological vibration sensor of the present invention has a sheet-shaped piezoelectric body and a pair of electrodes laminated on the front and back of the piezoelectric body, a first vibration detecting element disposed on the surface of a biological vibration generation site, and a sheet-shaped piezoelectric body. The piezoelectric device includes a piezoelectric body and a pair of electrodes stacked on the front and back of the piezoelectric body, and a second vibration detecting element disposed at a position different from the position at which the first vibration detecting element is disposed.本発明は、Ｓ／Ｎ比が大きい生体振動センサーを提供する。本発明の生体振動センサーは、シート状の圧電体及びこの圧電体の表裏に積層される一対の電極を有し、生体振動発生部位の表面に配置される第１振動検出素子と、シート状の圧電体及びこの圧電体の表裏に積層される一対の電極を有し、前記第１振動検出素子の配置位置と異なる位置に配置される第２振動検出素子とを備える。
