A relative lateral deviation calculating device calculates a relative lateral deviation between a vehicle and an on-coming vehicle, based on the state of the on-coming vehicle detected by an object detecting device and a future locus of movement for the vehicle estimated by a movement locus estimating device. When the relative lateral deviation is in a predetermined range, a contact-possibility determining device determines that there is a possibility that the vehicle will come into contact with the on-coming vehicle. Even when the relative lateral deviation is not in the predetermined range, if a steering-state detecting device has detected an involuntary steering operation by a driver, a contact avoiding device increases the steering reaction force of the steering wheel to inhibit the steering operation by the driver in a direction for the vehicle to approach the on-coming vehicle.