A driving support system comprising: a vehicle speed pulse acquisition unit adapted to acquire a vehicle speed pulse that is output by a vehicle speed sensor at predetermined intervals on the basis of a rotation of drive wheels of a vehicle (51, 101) as the vehicle (51, 101) runs; a vehicle position detecting unit (11,13) adapted to detect a current position of the vehicle (51, 101) on the basis of the vehicle speed pulse acquired by the vehicle speed pulse acquisition unit; a vehicle direction detecting unit (11, 13) adapted to detect a current direction of the vehicle (51, 101); a running direction acquisition unit adapted to acquire a normal running direction, which is a running direction specified for a road on which the vehicle (51, 101) runs, on the basis of the current position of the vehicle (51, 101) detected by the vehicle position detecting unit (11, 13); and a wrong-way driving detecting unit adapted to detect whether the vehicle (51, 101) is placed in a wrong-way driving situation in which the vehicle (51, 101) runs a wrong way on the road, on the basis of the current direction of the vehicle (51, 101) detected by the vehicle direction detecting unit (11, 13) and the normal running direction, characterized in that the wrong-way driving detecting unit is adapted to detect whether the vehicle (51, 101) is placed in the wrong-way driving situation in a state in which the vehicle speed pulse is acquired by the vehicle speed pulse acquisition unit at the predetermined intervals, and is adapted not to detect whether the vehicle (51, 101) is placed in the wrong-way driving situation in a state in which the vehicle speed pulse is not acquired by the vehicle speed pulse acquisition unit at the predetermined intervals. a vehicle speed pulse acquisition unit adapted to acquire a vehicle speed pulse that is output by a vehicle speed sensor at predetermined intervals on the basis of a rotation of drive wheels of a vehicle (51, 101) as the vehicle (51, 101) runs; a vehicle position detecting unit (11,13) adapted to detect a current position of the vehicle (51, 101) on the basis of the vehicle speed pulse acquired by the vehicle speed pulse acquisition unit; a vehicle direction detecting unit (11, 13) adapted to detect a current direction of the vehicle (51, 101); a running direction acquisition unit adapted to acquire a normal running direction, which is a running direction specified for a road on which the vehicle (51, 101) runs, on the basis of the current position of the vehicle (51, 101) detected by the vehicle position detecting unit (11, 13); and a wrong-way driving detecting unit adapted to detect whether the vehicle (51, 101) is placed in a wrong-way driving situation in which the vehicle (51, 101) runs a wrong way on the road, on the basis of the current direction of the vehicle (51, 101) detected by the vehicle direction detecting unit (11, 13) and the normal running direction, characterized in that the wrong-way driving detecting unit is adapted to detect whether the vehicle (51, 101) is placed in the wrong-way driving situation in a state in which the vehicle speed pulse is acquired by the vehicle speed pulse acquisition unit at the predetermined intervals, and is adapted not to detect whether the vehicle (51, 101) is placed in the wrong-way driving situation in a state in which the vehicle speed pulse is not acquired by the vehicle speed pulse acquisition unit at the predetermined intervals.