Optical measuring device according to the invention 1, the illumination fiber 5, a plurality of light receiving fibers 7 to 9, a light source unit 22 for supplying the illumination fiber 5 outputs generates light that illuminates the biological tissue 6, a plurality of measurement a vessel, a measurement unit 23 for each receiving fiber 7-9 to spectrophotometry, respectively the return light from the output to the living tissue, the measurement result by the measurement unit 23 and the control unit 26 to be stored in a predetermined storage unit 27 comprising, measuring unit 23 sequentially performs the characteristic value obtaining before the measurement of the returned light at a predetermined condition after the power supply, the characteristic value obtaining before the measurement, and the supply amount of light from the light source unit 22, the reflection state of light in biological tissue 6 or to start the spectral measurement of the characteristic values for the acquisition when it detects an increase in the received light intensity of the set amount based on the scattering state.本発明にかかる光学測定装置1は、照射ファイバ5と、複数の受光ファイバ7~9と、生体組織6を照射する光を出力発生して照射ファイバ5に供給する光源部22と、複数の測定器を有し、各受光ファイバ7~9が出力した生体組織からの戻り光をそれぞれ分光測定する測定部23と、測定部23による測定結果を所定の記憶部27に記憶させる制御部26とを備え、測定部は23、電力供給後に所定条件にて戻り光の特性値取得前測定を順次行い、特性値取得前測定において、光源部22からの供給光量と、生体組織6の光の反射状態または散乱状態とをもとに設定された量の受光強度の増加を検出したときに特性値取得用の分光測定を開始する。
