A unitized automobile body having a pair of hollow side frames connected to a floor panel and a roof panel. The rearward extensions of the side frames form hollow D-posts and hollow rear sills in the area over the rear wheel housings. The rear sills are connected by a deep rigid transverse rear panel. The forward extensions of the side frames form hollow A-posts and cowl side panels which are connected to a box-shaped rigid transverse panel formed by the cowl and firewall.
