The present invention relates to a headlight apparatus in which fastening of an occulter is independent from the fastening of a light source. To this end, the headlight apparatus includes an occulter with an occulting portion which is fitted in a reflector, the occulting portion being extended in length by a central portion which is terminated by a retaining foot held in a housing formed on an outer face of the reflector, at the level of an aperture formed in the body of the reflector, by mechanical pressure exerted between the walls of the housing and the retaining foot. Preferably, the retaining foot consists of a first tongue which is used as a locking key, and a second tongue which includes, in particular, a locking slot for receiving the locking key whereby to spread the retaining foot laterally.