A photoelectric sensor capable of saving a space is provided. A photoelectric sensor includes a case body with a substantially rectangular parallelepiped shape that accommodates at least one of a light projecting section and a light receiving section. The case body has a front surface that has a light projecting and receiving surface that allows at least one of light from the light projecting section and light to the light receiving section to pass therethrough and a rear surface that is located on a side opposite to the front surface, and a cable that accommodates cords that are connected to at least one of the light projecting section and the light receiving section via a control section is attached to the rear surface.