Head-up display device with impact protection

A head-up display device comprising a housing comprising a front wall, a rear wall facing the front wall, two opposing side walls connecting the side edges of the front wall and the rear wall, and a covering wall, said front, rear and side walls defining a cavity internal to the housing, and each comprising an upper edge, the covering wall being connected to the upper edges of the front, rear and side walls, so as to cover the internal cavity of the housing, said walls each comprise a lower edge opposite their corresponding upper edge, characterized in that at least one of the front, and/or rear and/or side walls comprises a frangible portion arranged so as to allow the covering wall to be moved closer to one of the lower edges by breaking said frangible portion under an effort exerted on said covering wall towards one of the lower edges, beyond a given limit;

• and the side walls each comprises a breaking line connecting their upper edge along a junction between the side wall and the front wall, or comprises a breaking line extending across the side wall from their upper edge to a portion of the junction between the side wall and the front wall.