A stereoscopic projection system is capable of minimizing a distance between viewing zones without reducing a distance between image projectors. In the stereoscopic projection system, a projector array having a plurality of image projectors are arranged substantially along an arrangement direction perpendicular to a connecting line between a left eye and a right eye of a viewer, and a directional screen has a first characteristic axis aligned at an angle with respect to the arrangement direction of the projector array, and a second characteristic axis perpendicular to the first characteristic axis. Therefore, the directional screen causes a plurality of images projected from the projector array to be relatively widened along the first characteristic axis and relatively narrowed along the second characteristic axis.