PURPOSE: To prevent a dazzlement to the driver of a following car by the light transmitting directly through a hologram, in a high mount stop lamp using a hologram.

CONSTITUTION: On the rear windshield 1 of an automobile, a film 3 with louver and a hologram 2 are provided by laminating them, and the light from a regenerating light source 10 is radiated to the hologram 2, the light is diffracted by the hologram 2 to reganarate a hologram image, and the system is functioned as a high mount stop lamp. A direct transmitted light transmitted without being diffracted by the hologram 2 is shielded by the louver 3a of the film with louver 3, and a dazzlement to the driver of a following car by the direct transmitted light is prevented.