PROBLEM TO BE SOLVED: To provide a biological information detector or others which can be easily assembled.SOLUTION: A biological information detector includes a light-emitting part 14 for emitting light R1 directed at a detection site O of a test subject, a light-receiving part 16 for receiving a light R1 produced by the light R1 emitted by the light-emitting part 14 being reflected at the detection site O and having biological information, a reflecting part 18 for reflecting the light R1 emitted by the light-emitting part 14 or the light R1 having biological information, a protecting part 19 for protecting the light-emitting part 14 or the light-receiving part 16, and a substrate 11 which is held between the reflecting part 18 and the protecting part 19 and in which the light-emitting part 14 is positioned on one side of the reflecting part 18 or the protecting part 19 and the light-receiving part 16 is positioned on the other side of the reflecting part 18 or the protecting part 19. The protecting part 19 has a contact surface with the test subject and the protecting part 19 is constituted of a transparent material relative to the wavelength of the light R1 emitted by the light-emitting part 14. The substrate 11 is constituted of a transparent material relative to the wavelength of the light R1 emitted by the light-emitting part 14.COPYRIGHT: (C)2011,JPO&INPIT【課題】 容易に組み立て可能な生体情報検出器等を提供する。【解決手段】 生体情報検出器は、被検査体の被検出部位Oに向かう光R1を発する発光部14と、発光部14が発する光R1が被検出部位Oにて反射された、生体情報を有する光R1’を受ける受光部16と、発光部14が発する光R1又は生体情報を有する光R1’を反射させる反射部18と、発光部14又は受光部16を保護する保護部19と、反射部18と保護部19との間に狭持され、反射部18又は保護部19の何れか一方の側に発光部14が配置され、且つ反射部18又は保護部19の何れか他方の側に受光部16が配置される基板11と、を含む。保護部19は、被検査体との接触面を有し、保護部19は、発光部14が発する光R1の波長に対して透明な材料で構成される。基板11は、発光部14が発する光R1の波長に対して透明な材料で構成される。【選択図】 図1