Using the non-invasive optical measurement technology, mood, provides a biological state evaluation apparatus for evaluating a biological state, such as emotion. light irradiating unit (1041) and the light receiving portion (1061), and an input means (112), presenting a plurality of challenges that differ to a subject (800) (first problem, the second problem) and, from the intensity of received light by the light receiving portion (1061) the calculated biological signals in the object, received by the input means the subjective information of the subject (112), the measurement point with respect to the first problem calculated and the relative value of the biological signal and the biological signal of the measuring point for the second problem, the difference between the subjective information and displays.非侵襲な生体光計測技術を用い、気分、感情などの生体状態を評価する生体状態評価装置を提供する。光照射部(1041)と受光部(1061)、および入力手段(112)を有し、被検体(800)へ異なる複数の課題(第1の課題、第2の課題)を呈示し、前記受光部(1061)で受光された光の強度から前記被検体の内部における生体信号を算出し、被検体の主観情報を入力手段(112)によって受け付け、第1の課題に対する計測点の生体信号と第2の課題に対する計測点の生体信号の相対値と、主観情報の差分を算出し、表示する。
