Abstract: A projection system suitable for reducing the convergence angles for red, green and blue color beams is disclosed. The projection system includes first and second beam projection tubes arranged in an in-line type arrangement in the center of the interior of a support part of the system, and a third beam projection tube placed beside the first and second beam projection tubes and inclined relative to the first and second projection tubes at predetermined inclination angles. A dichroic mirror is placed on an optical axis of the third projection tube in front of the third projection tube. The dichroic mirror transmits the beams projected by the first and second projection tubes but reflects the beam projected by the third projection tube. The third beam projection tube may be placed in back of the first and second beam projection tubes.