PROBLEM TO BE SOLVED: To reduce operational burden on a user by reducing restrictions in positioning a living body part on a detecting position, to simplify and miniaturize a configuration and reduce power consumption by preventing saturation of a light receiving element.SOLUTION: First and second optical members 1 and 2 are juxtaposed horizontally such that one side faces come into contact with each other and upper faces 1b and 2b form a same plane. A light-emitting element 3 is disposed facing an incidence plane 1a of the first optical member 1, and sensor light 5 emitted from the light-emitting element 3 is made to enter the first optical member 1 from the incidence plane 1a and is totally reflected. When a living body part 7 is brought into contact with the upper faces 1b and 2b of the optical members 1 and 2 simultaneously, scattering light components 6a generated in the living body part 7, in irradiation light 6 leaked from the first optical member 1 and applied to the living body part 7, are captured in the second optical member 2 from the upper face 2b, exited from an exit plane 2b, and received by a light receiving element 4.COPYRIGHT: (C)2014,JPO&INPIT【課題】検出位置への生体部位の位置合わせの制約を軽減してユーザの操作上の負担を減らし、かつ受光素子の飽和を防止したうえで構成の簡単小型化、低消費電力化を図る。【解決手段】第1及び第2の光学部材1,2を、その一方の側面同士が接触しかつ上面1b,2bが同一面を形成するように水平方向に並べて配置し、かつ第1の光学部材1の入射面1aに対向して発光素子3を配置し、この発光素子3により発光されたセンサ光5を第1の光学部材1内にその入射面1aから入射して全反射させるようにしている。そして、これらの光学部材1,2の上面1b,2bに同時に生体部位7を接触させたとき、第1の光学部材1から漏洩して生体部位7に照射された照射光6のうち、生体部位7内で発生した散乱光成分6aを第2の光学部材2にその上面2bから取り込んで出射面2bから出射させ、受光素子4で受光させる。【選択図】図1
