1. A traffic line recognition device comprising: a traffic line region candidate extraction section for extracting a traffic line region candidate, as a traffic line candidate, from a road image obtained by a TV camera installed on a vehicle; a two dimension/three dimension transform section for transforming two dimensional image coordinates of a pixel contained in the traffic line region candidate to three dimensional coordinates; a histogram production section for accumulating and projecting the three dimensional coordinates onto a coordinate system in a direction crossing a road and producing a histogram in the direction crossing the road; and a traffic line judgement unit for determining a traffic line based on a value of the histogram.