PROBLEM TO BE SOLVED: To provide a biological information measurement system for calculating the concentration of a light-absorbing substance in blood by using the principle of a pulse photometer.SOLUTION: A light emitting unit 10 emits first light including a first wavelength λ1 and second light including a second wavelength λ2. A light receiving unit 20 outputs a first signal S1 and second signal S2 in response to a light receiving intensity I1 of the first light and a light receiving intensity I2 of the second light resulting from the first light and second light having penetrated or having been reflected by a subject's biological tissue 2, respectively. A processing period setting unit 30 extracts a signal cycle corresponding to the subject's cardiac cycle from one of the first signal S1 and second signal S2, and sets a processing period for one of a first part in which influence of arterial blood's inflow to the biological tissue 2 is dominant in the signal cycle and a second part in which influence of venous blood's outflow from the biological tissue 2 is dominant. A concentration calculation unit 50 calculates the subject's concentration C of a light-absorbing substance in blood on the basis of a first variation ΔA1 and a second variation ΔA2.SELECTED DRAWING: Figure 1【課題】パルスフォトメータの原理を用いて血中吸光物質の濃度を算出する生体情報測定システムを提供する。【解決手段】発光部１０は、第一波長λ１を含む第一の光、および第二波長λ２を含む第二の光を出射し受光部２０は、被検者の生体組織２を透過または反射した第一の光の受光強度Ｉ１および第二の光の受光強度Ｉ２に応じて、それぞれ第一信号Ｓ１および第二信号Ｓ２を出力する。処理期間設定部３０は、第一信号Ｓ１と第二信号Ｓ２の一方について被検者の心周期に対応する信号周期を抽出し、信号周期内における生体組織２への動脈血の流入の影響が支配的な第一部分、生体組織２からの静脈血の流出の影響が支配的な第二部分の一方について、処理期間を設定する。濃度算出部５０は、第一変化量ΔＡ１と第二変化量ΔＡ２に基づいて、被検者の血中吸光物質の濃度Ｃを算出する。【選択図】図１
