BIOMETRIC INFORMATION ACQUISITION DEVICE

In the present invention, a plurality of pulse location candidate extraction units (38a to 38t) characterizes wave forms included in a vibration signal of a vibration sensor (VS) on the basis of predetermined specific shapes and extracts a series of pulse location candidates. A frequency distribution calculation unit (39) calculates the frequency distributions of pulse intervals and pulse intervalvariations for each of the extracted series of pulse location candidates. A distribution ratio calculation unit (40) calculates the distribution ratio of modal distribution relative to all frequencies for each of the calculated plurality of frequency distributions. A selection unit (41) selects one of the extracted plurality of series of pulse location candidates, with the calculated plurality ofdistribution ratios as an evaluation index that indicates the accuracy of the series of pulse location candidates. 多个搏动位置候补提取部(38a～38t)基于规定的特定形状对振动传感器(VS)的振动信号中含有的各个波形赋予特征，来提取系列搏动位置候补。频数分布计算部(39)对提取出的各个所述系列搏动位置候补计算搏动间隔或搏动间隔变动