[PROBLEMS] To detect a change in a respiratory state of a measurement subject without directly detecting respiration. A biological information measuring device includes a respiratory waveform extraction unit that extracts a respiratory waveform of a measurement subject from a pulse wave signal representing the pulse wave of the measurement subject, a first respiratory inflection point of the respiratory waveform, and A detecting unit that detects that the fluctuation range of the value corresponding to the difference from the second respiratory inflection point that appears next to the first respiratory inflection point has changed from the first fluctuation range to the second fluctuation range. 30. [Selection] Figure 4【課題】呼吸を直接検出することなく被測定者の呼吸状態が変化したことを検出することができる。【解決手段】生体情報測定装置１０は、被測定者の脈波を表す脈波信号から被測定者の呼吸波形を抽出する呼吸波形抽出部１３と、呼吸波形の第１の呼吸変曲点と第１の呼吸変曲点の次に現れる第２の呼吸変曲点との差分に相当する値の変動幅が、第１の変動幅から第２の変動幅に変化したことを検出する検出部３０と、を備える。【選択図】図４
