A long flexible substrate, a light emitting unit that emits near-infrared light, a light receiving unit that detects light, and a light shielding film, the light emitting unit being on the surface side of the flexible substrate and configured on the flexible substrate The light receiving portion is provided on the surface of the flexible substrate, is spaced from the first recess, and is provided on the second recess formed on the flexible substrate to shield the light. The film has translucency at the position where the light receiving unit and the light emitting unit are located, and is provided on the surface side of the flexible substrate. The light shielding film, the light emitting surface of the light emitting unit, and the light receiving surface of the light receiving unit Configured to form a surface.長尺状のフレキシブル基板と、近赤外光を照射する発光部と、光を検出する受光部と、遮光フィルムとを備え、発光部は、フレキシブル基板の表面側であって、フレキシブル基板に構成されている第１の凹部に設けられ、受光部は、フレキシブル基板の表面側であって、第１の凹部から離間しており、フレキシブル基板に構成されている第２の凹部に設けられ、遮光フィルムは、受光部と発光部が位置する箇所において透光性を有し、フレキシブル基板の表面側に設けられ、遮光フィルムと、発光部の発光面と、受光部の受光面とで、一つの面を形成するように構成される。
