The present invention provides a miniaturized in-vivo information measuring device that does not reduce accuracy of measurements. A rotating diffraction grating 110 is used to diffract reflection from a measuring subject 10 in order to reduce the number of the components of a spectroscopic system and the space required. In addition, the measuring subject 10 is replaced by a reflective member 140 to reflect incoming light from a measuring probe 106 and to emit the same toward the measuring probe 106, so that an optical path for obtaining the measured signal and an optical path for obtaining the reference signal can be commonized, the space required can be reduced, and accuracy of the calibration can be enhanced. As a result, a spectroscopic system as well as an optical system for reference signals can be miniaturized utile the accuracy of measurements is not reduced.本發明提供一種不會降低測量精確度且裝置構成小型化之活體資訊測量裝置。使用旋轉繞射光柵110將來自被檢測者10的反射光予以分光,藉此能減少分光光學系統的零件數及所需的空間。此外,設置用以代替被檢測者10將從測量用探針106所射入的光線予以反射並朝測量用探針106射出之反射構件140,藉此能將用以獲得測量訊號之光學路徑與用以獲得參考訊號之光學路徑予以共通化,而能減少所需的空間,並能使校正的精確度提升。如此,不會降低測量精確度,且能將分光光學系統及參考訊號用光學系統予以小型化。10‧‧‧被檢測者100‧‧‧活體資訊測量裝置101‧‧‧光源102‧‧‧針孔103‧‧‧聚光透鏡104‧‧‧光射入體105‧‧‧發光側光纖106‧‧‧測量用探針107‧‧‧受光側光纖108‧‧‧光射出體109‧‧‧透鏡系統110‧‧‧旋轉繞射光柵111‧‧‧繞射光柵121‧‧‧隙縫122‧‧‧光檢測器(亦簡稱為「PD」)123‧‧‧類比數位轉換電路(亦稱為A/D轉換電路)124‧‧‧殼體125‧‧‧開口部130‧‧‧運算裝置140‧‧‧反射構件
