PROBLEM TO BE SOLVED: To improve measurement accuracy of an oxygen circulation time as compared with a case of measuring an oxygen circulation time by using an inflection point of a predetermined appearance order obtained from a value representing an oxygen concentration in blood.SOLUTION: A biological information measuring device 10 measures the oxygen saturation level of a person being measured, refers to change in the measured oxygen saturation level, and measures a time since the resumption time of the breathing of the person being measured who stops breathing until a detection time of the inflection point of the oxygen saturation level that is detected within a proper period whose end time is set to be later than the resumption time and after the resumption time, as an oxygen circulation time.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2020,JPO&INPIT【課題】血中の酸素濃度を表す値から得られる予め定めた出現順序の変曲点を用いて酸素循環時間を測定する場合と比較して、酸素循環時間の測定精度を向上する。【解決手段】生体情報測定装置１０は、被測定者の酸素飽和度を測定し、測定した酸素飽和度の変化を参照して、呼吸を停止している被測定者の呼吸の再開時刻から、終期が再開時刻より後に設定されている適正期間内で、かつ、再開時刻より後に検知された酸素飽和度の変曲点の検知時刻までの時間を酸素循環時間として測定する。【選択図】図４
