To provide an optical measuring apparatus capable of accurately measuring a substance concentration such as blood sugar content even when an optical path length of a measurement site to be measured is changed.An optical measuring apparatus of the present invention includes a light emitting unit that emits light used for measurement, a lens that is an optical element that guides a light beam emitted from the light emitting unit to a measurement site, A light receiving portion 19 for receiving light rays transmitted through the measurement portion 18, a movable support portion 16 for changing the optical path length of the light beam by displacing the lens 14, and a movable support portion 16 for controlling the movable support portion 16 and based on the output of the light receiving portion 19 And an arithmetic control unit 17 for calculating a blood glucose level.BACKGROUND OF THE INVENTION【課題】測定を行う被測定部位の光路長が変更された場合でも正確に血中糖度等の物質濃度を計測することができる光学測定装置を提供する。【解決手段】本発明の光学測定装置10は、測定に用いられる光線を射出する発光部11と、発光部11から射出される光線を被測定部位18に導く光学素子であるレンズ14と、被測定部位18を透過した光線を受光する受光部19と、レンズ14を変位させることで光線の光路長を変化させる可動支持部16と、可動支持部16を制御すると共に受光部19の出力に基づいて血糖値を算出する演算制御部17と、を具備している。【選択図】図1
