An automotive lighting device like a headlamp or headlight, comprising a body in which at least one lamp is housed, and a quick system for assembling the lamp on the body and/or on a possible reflector coupled with the body, wherein the lamp comprises a bulb and a lamp socket made of an electrically non-conductive material and integrally connected in one piece to the bulb; and wherein the lamp socket is provided with respective male contacts arranged laterally protruding from the lamp socket at a right angle with respect to an axis of the lamp; the quick system for assembling the lamp comprising a base which can be secured, in use, to the body and/or reflector, bayonet-type receiving means for the lamp socket carried by the base, bayonet-type assembly means carried by the lamp socket and complementary to the receiving means of the base, and a connector made of an electrically non-conductive material and integrally provided with respective female contacts which can be coupled by means of the movement of the connector perpendicular to said axis, to the male contacts of the lamp socket; characterized in that, in combination: i)- the connector comprises at least one projecting part obtained so as to protrude from a frontal face of the connector which, with the connector being coupled to the lamp socket, faces in use the bulb, and is arranged substantially parallel to the axis; ii)- the base, towards the lamp socket, is provided with a channel arranged transversally to the axis and shaped so as to receive, in an undercut-like slidingly coupled manner, said at least one projecting part of the connector when the lamp socket is bayonet coupled to the base, so as to prevent relative movements between the connector and the lamp socket perpendicular to the axis and thus keep the female contacts of the connector safely coupled to the male contacts of the lamp socket; iii)- said axis of the lamp coincides with a relative rotation axis (A') between the lamp socket and the base with respect to which, in use, the bayonet coupling is achieved between the bayonet-type receiving means of the base and the bayonet-type assembly means of the lamp socket. i)- the connector comprises at least one projecting part obtained so as to protrude from a frontal face of the connector which, with the connector being coupled to the lamp socket, faces in use the bulb, and is arranged substantially parallel to the axis; ii)- the base, towards the lamp socket, is provided with a channel arranged transversally to the axis and shaped so as to receive, in an undercut-like slidingly coupled manner, said at least one projecting part of the connector when the lamp socket is bayonet coupled to the base, so as to prevent relative movements between the connector and the lamp socket perpendicular to the axis and thus keep the female contacts of the connector safely coupled to the male contacts of the lamp socket; iii)- said axis of the lamp coincides with a relative rotation axis (A') between the lamp socket and the base with respect to which, in use, the bayonet coupling is achieved between the bayonet-type receiving means of the base and the bayonet-type assembly means of the lamp socket.