To provide an obstacle position specifying system, capable of maintaining high determination precision of distance to an obstacle in a stereoscopic view without fixing a right and a left camera devices onto a car body by means of hard support parts.

Based on two image data taken by two far-infrared camera units to photograph an area ahead of a vehicle, characteristic parts of the images such as lateral length edges and high brightness parts of a higher value than a prescribed brightness are extracted, and the characteristic parts extracted from the two image data are overlapped with each other to determine the number of picture elements where they overlap with each other. One image is shifted to the other image vertically by the unit of picture elements in such a way that the number of overlapped picture elements becomes the maximum. In a state where the number of the overlapped picture elements becomes the maximum, distance of the obstacle to the vehicle is determined.