The optical measurement apparatus of the present invention, a temperature sensor of the one for detecting the temperature of the heat radiation from the plurality of light emitting elements for emitting light of a predetermined wavelength, I is obtained in advance on the emission light for each of the plurality of light-emitting elements by referring to data indicating the correspondence relationship between the extinction coefficient and the temperature will vary with the temperature, and corrects the extinction coefficient values of the materials of interest in the subject based on the temperature of the heat radiation that is detected by the temperature sensor I comprises, and extinction coefficient correction unit.本発明の生体光計測装置は、所定の波長の光を出射する複数の発光素子からの放熱の温度を検出する一の温度センサと、前記複数の発光素子の出射光ごとに予め求めておいた温度と、前記温度に伴って変動する吸光係数値との対応関係を示すデータを参照して、前記温度センサによって検出された放熱の温度に基づき被検体内の注目物質の吸光係数値を補正する吸光係数補正部と、を備える。
