1. A pedestrian extracting apparatus for extracting a pedestrian from an input image picked up by image pick-up means based on a pattern matching between the input image and model images of the pedestrian, comprising: prospective pedestrian extracting means for extracting a whole-body region surrounding a whole-body model image and a prospective part region surrounding a part model image of the whole body from the input image based on a pattern matching using the whole-body model image and the part model image of the pedestrian; and pedestrian extracting means for determining whether or not an extracted prospective part region is a part of the pedestrian if a prospective part region exists in the whole-body region extracted by the prospective pedestrian extracting means.