A vehicle driving assist system, comprising: a traveling situation detection means (5, 6) for detecting a vehicle condition and a traveling environment around a subject vehicle; a risk potential calculation means for calculating a risk potential around the subject vehicle based upon detection results of the traveling situation detection means (5, 6); an accelerator pedal reaction force control means (15, 9) for controlling an actuation reaction force which is generated for an accelerator pedal based upon the risk potential which has been calculated by the risk potential calculation means; an actuation amount detection means for detecting an actuation amount of the accelerator pedal; and a vehicle distance control means (2, 3, 11, 12, 21, 22) for controlling drive force/braking force of the subject vehicle so that the subject vehicle follows a preceding vehicle present in front of the subject vehicle based upon the accelerator pedal actuation amount which is detected by the actuation amount detection means, characterised in that the vehicle distance control means (2, 3, 11, 12, 21, 22) (a) sets a target distance between the subject vehicle and the preceding vehicle so that the target distance becomes smaller as the accelerator pedal actuation amount becomes greater when the accelerator pedal actuation amount is within a predetermined range of equal to or greater than a minimum value (Smin) predetermined for setting the target distance and equal to or smaller than a maximum value (Smax) predetermined for setting the target distance, and (b) performs vehicle distance control so as to maintain the target distance when the accelerator pedal is actuated and the accelerator pedal actuation amount is within the predetermined range of equal to or greater than the minimum value (Smin) and equal to or smaller than the maximum value (Smax); the traveling situation detection means (5, 6) detects a subject vehicle speed, the vehicle distance and a relative speed between the subject vehicle and the preceding vehicle; the risk potential calculation means calculates the risk potential based upon the subject vehicle speed, the vehicle distance, and the relative speed which are detected by the traveling situation detection means (5, 6); and the accelerator reaction force control means (15, 9) controls the actuation reaction force according to the risk potential calculated based on the subject vehicle speed, the vehicle distance and the relative speed when the accelerator pedal actuation amount is in a range of smaller than the minimum value (Smin) or in a range of equal to or greater than the minimum value (Smin). a traveling situation detection means (5, 6) for detecting a vehicle condition and a traveling environment around a subject vehicle; a risk potential calculation means for calculating a risk potential around the subject vehicle based upon detection results of the traveling situation detection means (5, 6); an accelerator pedal reaction force control means (15, 9) for controlling an actuation reaction force which is generated for an accelerator pedal based upon the risk potential which has been calculated by the risk potential calculation means; an actuation amount detection means for detecting an actuation amount of the accelerator pedal; and a vehicle distance control means (2, 3, 11, 12, 21, 22) for controlling drive force/braking force of the subject vehicle so that the subject vehicle follows a preceding vehicle present in front of the subject vehicle based upon the accelerator pedal actuation amount which is detected by the actuation amount detection means, characterised in that the vehicle distance control means (2, 3, 11, 12, 21, 22) (a) sets a target distance between the subject vehicle and the preceding vehicle so that the target distance becomes smaller as the accelerator pedal actuation amount becomes greater when the accelerator pedal actuation amount is within a predetermined range of equal to or greater than a minimum value (Smin) predetermined for setting the target distance and equal to or smaller than a maximum value (Smax) predetermined for setting the target distance, and (b) performs vehicle distance control so as to maintain the target distance when the accelerator pedal is actuated and the accelerator pedal actuation amount is within the predetermined range of equal to or greater than the minimum value (Smin) and equal to or smaller than the maximum value (Smax); the traveling situation detection means (5, 6) detects a subject vehicle speed, the vehicle distance and a relative speed between the subject vehicle and the preceding vehicle; the risk potential calculation means calculates the risk potential based upon the subject vehicle speed, the vehicle distance, and the relative speed which are detected by the traveling situation detection means (5, 6); and the accelerator reaction force control means (15, 9) controls the actuation reaction force according to the risk potential calculated based on the subject vehicle speed, the vehicle distance and the relative speed when the accelerator pedal actuation amount is in a range of smaller than the minimum value (Smin) or in a range of equal to or greater than the minimum value (Smin).