PROBLEM TO BE SOLVED: To generate a signal in which influence from body motion is reduced.SOLUTION: A signal processing device includes a signal processing unit for the more emphasizing a part the smaller the part with intensity of an envelope curve of a detection signal that indicates a temporal change of intensity of light that has passed through an organism.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2019,JPO&INPIT【課題】体動の影響を低減した信号を生成する。【解決手段】生体を通過した光の強度の時間変化を表す検出信号のうち、当該検出信号の包絡線の強度が小さい部分ほど強調する信号処理部を具備する信号処理装置。【選択図】図3