To analyze a blood flow index of a living body accurately.SOLUTION: A living body analysis device includes: a light emitting unit for emitting a laser beam onto a living body； a light receiving unit for receiving a light reflected inside the living body onto which the laser beam is emitted； and an index calculation unit for calculating a blood flow index of the living body from the intensity in a frequency range with a frequency lower than a variable cut-off frequency as a lower limit from the intensity spectrum in which a component lower than the variable cut-off frequency in a detection signal indicating the intensity of the light received by the light receiving unit is removed.SELECTED DRAWING: Figure 3【課題】生体の血流指標を高精度に解析する。【解決手段】生体にレーザー光を照射する発光部と、前記レーザー光が照射された前記生体の内部で反射した光を受光する受光部と、前記受光部による受光強度を表す検出信号において可変の遮断周波数を下回る成分を除去した強度スペクトルのうち、前記遮断周波数よりも低い周波数を下限値とした周波数範囲内の強度から、前記生体の血流指標を算定する指標算定部とを具備する生体解析装置。【選択図】図３
