PROBLEM TO BE SOLVED: To provide a device capable of accurately calculating a light transmittance of blood.SOLUTION: A component measurement device includes: a light-emitting element 12 arranged to irradiate a measurement light 16 onto a first area 2b and a second area 2c a light receiving element for measurement 22a arranged to detect a reflected light 17 reflected by the first area 2b and to output a first light intensity of light having a predetermined wavelength a light receiving element for reference 22b arranged to detect the reflected light 17 by the second area 2c and to output a second light intensity of light having a predetermined wavelength a memory arranged to store a rate of the measurement light 16 passing through a blood vessel 23 in the first area 2b and a light absorption spectrum calculator arranged to calculate a light transmittance of the blood vessel 23 using the rate of the measurement light 16 passing through the blood vessel 23, the first light intensity and the second light intensity. The memory stores the rate of light passing through the blood vessel 23 in association with the light having a predetermined wavelength received by the light receiving element for measurement 22a. The light absorption spectrum calculator calculates the light transmittance of the blood vessel 23 using the rate of the light having a predetermined wavelength received by the light receiving element 22 passing through the blood vessel 23.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2016,JPO&INPIT【課題】精度良く血液の光透過率を演算する装置を提供する。【解決手段】成分測定装置は第1領域2b及び第2領域2cに測定光16を照射する発光素子12と、第1領域2bにて反射した反射光17を検出し所定の波長の光の第1光強度を出力する測定用受光素子22aと、第2領域2cにて反射した反射光17を検出し所定の波長の光の第2光強度を出力する参照用受光素子22bと、第1領域2bにおいて血管23を測定光16が通過する割合を記憶するメモリーと、血管23を測定光16が通過する割合と第1光強度と第2光強度とを用いて血管23の光透過率を演算する吸光スペクトル算出部と、を備え、メモリーは測定用受光素子22aが受光する所定の波長の光に対応して血管23を光が通過する割合を記憶し、吸光スペクトル算出部は受光素子22が受光する所定の波長の光が血管23を通過する割合を用いて血管23の光透過率を演算する。【選択図】図7
