1. A system for recognizing a traffic lane marking line for a vehicle comprising: image photographing means for photographing a range including a road surface in a direction of travel of the vehicle; traffic lane marking line recognizing means configured to be capable of recognizing at least a traffic lane marking line in a broken line on the road surface in a photographed image photographed by the image photographing means; image compositing means for compositing a plurality of images photographed at different time points by the image photographing means to elongate the traffic lane marking line in the photographed images; and vehicle condition detecting means for detecting a fore-aft direction angle of the vehicle relative to the traffic lane marking line and a distance of the vehicle from the traffic lane marking line in the plurality of images to be composited by the image compositing means and determining deviations of the angles and distances between the plurality of the images; wherein the image compositing means composites the plurality of images, after correcting the plurality of images such that the angles and distances of the vehicle relative to the traffic lane marking line are equal to each other in the plurality of images based on the deviations of the angles and distances determined by the vehicle condition detecting means.