PROBLEM TO BE SOLVED: To provide a biological information acquisition device which has a vibration sensor detecting vibration including a subjects heartbeat and accurately calculates the subjects cardiac rate or fluctuation of pulsation interval.SOLUTION: A sensor selection part 10 selects the vibration sensor outputting the waveform having clear amplitude equal to R wave in an electrocardiogram among a plurality of vibration sensors 3A-3C. A fluctuation calculation part 12 calculates a subjects cardiac rate or fluctuation of pulsation interval according to the vibration signals of the selected vibration sensor. The sensor selection part 10 grasps the waveform having the clear amplitude equal to the R wave of the electrocardiogram on the basis of the amplitude ratio of maximal waveform and the previous waveform or the amplitude ratio of maximal waveform and the before and after waveform.COPYRIGHT: (C)2015,JPO&INPIT【課題】被験者の鼓動を含む振動を検出する振動センサを備えた生体情報取得装置において、被験者の心拍数又は搏動間隔のゆらぎの算出を精度良く行う。【解決手段】センサ選択部10は、複数の振動センサ3A~3Cのうち、心電図のR波相当の振幅が明瞭な波形を出力している振動センサを選択する。ゆらぎ算出部12は、選択された振動センサの振動信号に基づいて被験者の心拍数又は搏動間隔のゆらぎを算出する。センサ選択部10は、心電図のR波相当の振幅が明瞭な波形を、極大波形とその前波形との振幅比、又は極大波形とその前後波形との振幅比を基準として把握する。【選択図】図3
