To highly accurately analyze a pulse wave from a pulse wave signal.SOLUTION: Provided is a pulse wave analyzer, comprising: a component extraction unit for extracting, as an observation signal, a component within an analysis band including the fundamental frequency of the pulse wave of a living body from a pulse wave signal representing the pulse wave； a first processing unit for generating an in-phase signal by multiplying the observation signal by a first periodic signal which varies in the fundamental frequency； a second processing unit for generating an orthogonal signal by multiplying the observation signal by a second periodic signal which intersects the first periodic signal at right angles and varies in the fundamental frequency； a difference calculation unit for determining, as a frequency variation indicator representing the frequency variation relative to the fundamental frequency, a difference between a first declination which is specified by the in-phase signal and the orthogonal signal and indicated by a signal value at a first point on the time axis and a second declination which is specified by the in-phase signal and the orthogonal signal and indicated by a signal value at a second point different from the first point； and an indicator calculation unit for calculating a period indicator regarding the pulse period of the living body from the frequency variation indicator.SELECTED DRAWING: Figure 3【課題】脈波信号から高精度に脈波を解析する。【解決手段】生体の脈波を表す脈波信号のうち、当該脈波の基本周波数を含む解析帯域内の成分を観測信号として抽出する成分抽出部と、前記基本周波数で変動する第１周期信号を、前記観測信号に乗算することで、同相信号を生成する第１処理部と、前記第１周期信号に直交し、前記基本周波数で変動する第２周期信号を、前記観測信号に乗算することで、直交信号を生成する第２処理部と、前記同相信号および前記直交信号で規定され、時間軸上の第１時点における信号値が示す第１偏角と、前記同相信号および前記直交信号で規定され、前記第１時点とは異なる第２時点における信号値が示す第２偏角との差分を、前記基本周波数に対する周波数の変動を表す周波数変動指標として算定する差分算定部と、前記生体の脈周期に関する周期指標を前記周波数変動指標から算定する指標算定部とを具備する脈波解析装置。【選択図】図３
