An object of the present invention is to measure the state of body fluid with high accuracy when the thickness of an object to be measured is thin. A light source that emits light of a predetermined wavelength, a polarizer that converts light emitted from the light source into linearly polarized light, a modulator that modulates the polarization direction of the linearly polarized light, and a modulator that is modulated by the modulator. And at least one mirror that reflects the reflected light in the object to be measured, and scattered light scattered in the object to be measured from the transmitted light based on the polarization direction of the light transmitted from the object to be measured. A measuring apparatus comprising: an analyzer that separates； and a detector that detects the transmitted light from which scattered light has been separated by the analyzer. [Selection] Figure 3【課題】被測定物の厚みが薄い場合に体液の状態を高精度で測定する。【解決手段】所定の波長の光を発する光源と、前記光源から射出された光を直線偏光に変換する偏光子と、前記直線偏光の偏光方向を変調する変調器と、前記変調器で変調された光を被測定物中で反射させる少なくとも１つ以上のミラーと、前記被測定物からの透過光の偏光方向に基づいて、前記透過光から前記被測定物中にて散乱された散乱光を分離する検光子と、前記検光子で散乱光が分離された前記透過光を検出する検出器と、を備える測定装置。【選択図】図３
