PROBLEM TO BE SOLVED: To further increase hematocrit value measurement accuracy.SOLUTION: A hematocrit value measuring device includes a first light source 1 (1-1) for irradiating a light of a first wavelength λA onto a biological tissue 303 including a blood vessel 301, a second light source 1 (1-2) for irradiating a light of a second wavelength λB different from the first wavelength λA onto the biological tissue 303 including the blood vessel 301, and a light detector 2 for detecting light volume of the light of the first wavelength λA and the light of the second wavelength λB diffused and propagated in the biological tissue 303 and emitted to the outside as diffuse reflection light volume. The light of the first wavelength λA is a light of a wavelength exhibiting main absorption to hemoglobin, and the light of the second wavelength λB is a light of a wavelength exhibiting an equal light absorption coefficient to hemoglobin and water.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】ヘマトクリット値の測定精度をさらに高める。【解決手段】血管３０１を含む生体組織３０３に対して第１の波長λＡの光を照射する第１の光源１（１－１）と、血管３０１を含む生体組織３０３に対して第１の波長λＡとは異なる第２の波長λＢの光を照射する第２の光源１（１－２）と、生体組織３０３内を拡散伝搬して外部へ出射される第１の波長λＡの光および第２の波長λＢの光の光量を拡散反射光量として検出する光検出器２とを設け、第１の波長λＡの光をヘモグロビンに主要な吸収を呈する波長の光とし、第２の波長λＢの光をヘモグロビンと水とで等しい光吸収係数を呈する波長の光とする。【選択図】 図１
