A wide angle projection lens includes, in sequential order from an image side, a first lens group of negative refractive power, the first lens group having at least one aspheric surface, a second lens group, and a third lens group of positive refractive power. For the wide angle projection lens, the following Conditions (1) to (4) are satisfied: |F.sub.1/F|.gtoreq.4.5 (Condition (1)); 2.5.ltoreq.|F.sub.2/F|.ltoreq.6.0 (Condition (2)); 3.8.ltoreq.|F.sub.3/F|.ltoreq.5.0 (Condition (3)); and 0.8.ltoreq.BFL/F.ltoreq.1.4 (Condition (4)). An optical engine, including the wide angle projection lens, can be implemented in a projection display device.