As for the optical measuring unit, the light which is supplied from the end face by the illuminant and the illuminant which supply the lighting light which at least possesses one spectrum component it is spread to the Tip, from the lighting fiber 35 which from the Tip irradiates light to the scatterer and the Tip it outputs the reflected light from the scatterer which incidence is done respectively from the end face, the light absorbent fiber 36 where Tip position of the longitudinal direction differs mutually and light absorbent fiber 37 and, the end face of the 1st light absorbent fiber and dispersion on the basis of the detection result due to the sensing station and the sensing station which detect the light which is output from the end face of the 2nd light absorbent fiberThe test section which measures the property of the body and, it has.光学測定装置は、少なくとも一つのスペクトル成分を有する照射光を供給する光源と、光源によって基端から供給された光を先端に伝播し、先端から散乱体に光を照射する照射ファイバ35と、先端から入射した散乱体からの戻り光を基端からそれぞれ出力し、長手方向の先端位置が互いに異なる受光ファイバ36および受光ファイバ37と、第1の受光ファイバの基端および第2の受光ファイバの基端から出力された光を検出する検出部と、検出部による検出結果をもとに散乱体の特性を測定する測定部と、を備える。
