The present invention provides a living-body vibration sensor having a large S/N ratio. This living-body vibration sensor is provided with: a first vibration detection element disposed on a surface of a vibration-generating portion of a living body, the first vibration detection element having a sheet-shaped piezoelectric body and a pair of electrodes layered on the front and back of the piezoelectric body; and a second vibration detection element disposed in a position different from the position where the first vibration detection element is disposed, the second vibration detection element having a sheet-shaped piezoelectric body and a pair of electrodes layered on the front and back of the piezoelectric body.
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