PROBLEM TO BE SOLVED: To provide a pulse oximeter which can improve optical coupling efficiency significantly and has a large SN ratio and good measurement accuracy.SOLUTION: A pulse oximeter includes a light source 1, a sheet light guide body 3 of a light receiving side, and a photodetector 5. The sheet light guide body 3 of the light receiving side has a light incident surface 34 being a part of a surface of the sheet light guide body 3 of the light receiving side and making light L from an analyte 6 be incident to the inside of the sheet light guide body 3 of the light receiving side, and a light reflection surface 35 being an inclined surface to the light incident surface 34 and reflecting the light L incident to the inside of the sheet light guide body 3 of the light receiving side toward the inside of the sheet light guide body 3 of the light receiving side.COPYRIGHT: (C)2016,JPO&INPIT【課題】光結合効率を大幅に向上できて、SN比が大きくて測定精度のよいパルスオキシメーターを提供する。【解決手段】パルスオキシメーターは、光源1と、受光側のシート状導光体3と、光検出器5とを含む。受光側のシート状導光体3は、その受光側のシート状導光体3の表面の一部であって、被検体6からの光Lを受光側のシート状導光体3内部に入射させる光入射面34と、光入射面34に対して傾斜した面であって、受光側のシート状導光体3内部に入射した光Lを受光側のシート状導光体3の内部に向けて反射する光反射面35とを有する。【選択図】図1
