PROBLEM TO BE SOLVED: To provide a sensor having high sensing performance.SOLUTION: A sensor for irradiating light to the skin surface of a subject with a light-emitting element 3a, receiving light reflected at the skin surface and light passing through a body to arrive with a light-receiving element 3b, and detecting a surface state of the skin surface in accordance with an output current from the light-receiving element 3b to be outputted in accordance with a surface state of skin includes a circuit board, the light-emitting element 3a located on one principal plane of the circuit board 30, the light-receiving element 3b located at a place different from that of the light-emitting element 3a on one principal plane of the circuit board 30, and an optical element 4 arranged separately from one principal plane of the circuit board 30. The optical element 4 includes a first lens 4a for condensing light from the light-emitting element 3a onto the skin surface to guide the light, and a second lens 4b for guiding the light reflected at the skin surface to the light-receiving element 3b.COPYRIGHT: (C)2016,JPO&INPIT【課題】 センシング性能の高いセンサを提供する。【解決手段】 発光素子3aにより被験者の肌表面に光を照射し、肌表面で反射される光や体内を通過して到達した光を受光素子3bで受光して、肌の表面状態に応じて出力される受光素子3bからの出力電流に応じて、肌表面の表面状態を検出するセンサであって、基板と、基板30の一主面に位置する発光素子3aと、基板30の一主面であって、発光素子3aと異なる箇所に位置する受光素子3bと、基板30の一主面と間隔を空けて配置される光学素子4と、を備え、光学素子4は、発光素子3aからの光を肌表面に集光して導く第1レンズ4aと、肌表面によって反射された光を受光素子3bに導く第2レンズ4bと、を含むものである。【選択図】 図1
