FIG. 8B is a side view of the first lens array 56 shown in FIG. 8A seen from the direction 8B of FIG. 8A. FIG. 8C is a side view of the first lens array 56 shown in FIG. 8A seen from the direction 8C of FIG. 8A. As is described above, the first lens array 56 includes the plurality of first lenses 56A arranged two dimensionally.