A vehicle driving assist device includes a traveling environment recognizer, an obstacle recognizer, an emergency collision, an oncoming moving body recognizer, a lateral position calculator, a risk degree calculator, and a preliminary collision avoidance controller. The obstacle recognizer recognizes, based on information recognized by a traveling environment recognizer, an obstacle on a vehicle's traveling path. An emergency collision avoidance controller performs emergency collision avoidance control for avoiding a collision with the obstacle. An oncoming moving body recognizer recognizes, an oncoming moving body in an oncoming lane. A lateral position calculator calculates a distance from a lane marker defining the oncoming lane to a reference position of the oncoming moving body. A risk degree calculator calculates a risk degree for the oncoming moving body. A preliminary collision avoidance controller recognizes the oncoming moving body as the obstacle, and performs preliminary control before the emergency collision avoidance control.