PHOTOELECTRIC SENSOR AND METHOD FOR MANUFACTURING SAME

Provided is a photoelectric sensor capable of being securely joined to a housing while being sufficiently resistant to dirt. A housing of a photoelectric sensor has an opening which allows passage of at least one of light from a light projecting unit and light to a light receiving unit , and is provided with a cover lens which covers the opening and is optically transmissive. The cover lens is joined to an edge portion of the housing defining the opening . An outer surface of the cover lens is provided with antifouling coating . An inner surface of the cover lens has a joint portion which is in contact with the edge portion and is not provided with the antifouling coating