The present invention provides a main body unit of an optical fiber photoelectric sensor and the optical fiber photoelectric sensor, which improves optical coupling efficiency of a light emitting element and a light projecting side optical fiber and is capable of making uniform light incident on the light projecting side optical fiber without highly accurately positioning the light emitting element and a condenser lens. The main body unit of the optical fiber photoelectric sensor makes light emitted from an LED chip converge by the condenser lens and incident on the light projecting side optical fiber; and also makes light not incident on the condenser lens and emitted around the condenser lens reflect by a reflecting surface provided around the condenser lens, then refract the reflected light by a refractive surface, and incident on the light projecting side optical fiber.