A vehicle driving assist system is provided with a risk factor detection section, a first risk potential calculation section, a second risk potential calculation section and a risk potential notification section. The risk factor detection section detects a plurality of potential risk factors related to a host vehicle. The first risk potential calculation section calculates a first risk potential attributed to a first risk factor from the risk factors that were detected. The second risk potential calculation section calculates a second risk potential attributed to a second risk factor that is different than the first risk factor from the risk factors that were detected. The risk potential notification section notifies a driver of the first risk potential with a first risk potential notification and the second risk potential with a second risk potential notification using a common risk notification device with the first and second notifications being different.