A two dimensional image forming device includes a laser light source which is a coherent light source; a prism array that changes the traveling direction of a beam exiting from the laser light source; a driving portion that rotates the prism array; a rod integrator that guides the exiting beam deflected on the prism array while allowing the beam to undergo internal reflection; a projection optical system that projects the exiting end face of the rod integrator onto a two dimensional spatial light modulation element; and a projection lens that projects light exiting from the two dimensional spatial light modulation element onto a specific plane within a space.