As illustrated in FIG. 2, it is possible to arrange a right-left pair of front cameras 16, 16 at a front windshield 15 to recognize a target at each of the center, right, and left in front of an automobile 14, and to arrange a right-left pair of rear cameras 18a, 18b at lower sections of right-left door mirrors 17a, 17b to recognize a target at the lateral rear. In another embodiment, it is also possible to arrange an all-direction camera system by adding another camera to the cameras described above.