The measurement accuracy of biological information related to oxygen circulation time is reported. A biological information measuring apparatus 10 measures the oxygen saturation of a measurement subject, and measures cardiac output according to a conforming condition when measuring cardiac output with a waveform representing a change in oxygen saturation. A reliability D indicating the degree of conformity or nonconformity of the waveform of oxygen saturation to the measurement is reported. [Selection] Figure 15【課題】酸素循環時間に関連した生体情報の測定精度を報知する。【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、酸素飽和度の変化を表す波形によって心拍出量の測定を行う場合、適合条件に従って、心拍出量の測定に対する酸素飽和度の波形の適合度合い又は不適合度合いを表す信頼度Ｄを報知する。【選択図】図１５
