| 摘要 |
A detector that can detect an obstacle in a detection field with simple configuration and at low cost is provided. In the detector 10 having a base 11 to be mounted on a ceiling, a wall, or the like, a sensor section 12 which is mounted on the surface of the base, and a cover which is mounted on the base so as to cover the sensor section, the detector 10 is configured such that a obstacle detection sensor 20 for detecting a change of reflectance on and around the surface of the cover can be provided outside the cover 13. The obstacle detection sensor 20 includes light emitting elements 25 and 26 for emitting light to locations on and around the surfaces of the cover, and a light receiving element 24 for receiving reflected light from those locations.
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