PROBLEM TO BE SOLVED: To provide an internal information measuring device whose measurement accuracy can be improved by increasing the depth resolution when detection internal information of a subject to be measured is retrieved and whose light intensity efficiency can be increased.SOLUTION: A jaundice meter as an optical internal information measuring device emits light from LEDs 21 and 22 in a measurement head Hd in the direction inclined with respect to a normal NL to a measuring window WM whose surface to be brought into contact in parallel with the body surface of the subject to be measured is formed on a measurement reference surface FP. A plurality of reflected light beams which go out of the body through a long optical path LR and a short optical path SR in the body are individually detected by light receiving elements PD1 and PD2, and a bilirubin level of an intracorporal layer of fat PI is calculated. The depth distribution of the long optical path LR and the short optical path SR can be easily sharpened by oblique incidence and the depth resolution is improved. The light intensity efficiency can be increased by using the directivity of the incident light.COPYRIGHT: (C)2012,JPO&INPIT【課題】測定対象体の検出内部情報を取り出す際の深さ分解能を向上させることで計測精度を向上させ、且つ、光量効率を上げることができる内部情報計測装置を提供する。【解決手段】光学的内部情報計測装置としての黄疸計は、測定ヘッドHdにおいて、被測定者の体表に平行に接触させる面を計測基準面FPに形成した計測窓WMの法線NLから傾斜した方向に、LED21,22から投光を行う。この光が体内の長光路LRおよび短光路SRを経由して体外へ出た複数の反射光を、受光素子PD1、PD2で個別に検出して、体内脂肪層PIのビリルビン濃度を算出する。斜め入射によって長光路LRと短光路SRとの深さ分布をシャープにすることが容易となり、深さ分解能が向上する。また、入射光の指向性を利用して光量効率を上げることができる。【選択図】図10
