A driving support apparatus (12) is configured to support a vehicle (1) to travel at a parking lot, a parking spot (PS) at which the vehicle should be parked is defined by a parking section line (PL) at the parking lot, the driving support apparatus is configured to: detect a specific edge part (PLE) of the parking section line that is an edge part nearest to a traveling space at which the vehicle travels at the parking lot; set a virtual road section line (VDL) if a plurality of specific edge parts are detected at a specific area (LSA, RSA) located on a predetermined side viewed from the vehicle, the virtual road section line is an approximate line connecting the plurality of detected specific edge parts at the specific area; and support the vehicle to travel on the basis of the set road section line.