A vehicle driving assistant comprising: a side obstacle detector for detecting an obstacle present in an obstacle detection area (K-AREA), with at least a posterolateral direction of an own vehicle as the obstacle detection area (K-AREA); an obstacle access prevention controller for implementing an obstacle access prevention control which assists an access prevention for preventing the own vehicle from accessing the obstacle detected by the side obstacle detector; a future position estimator for estimating a future position which is a position of the own vehicle after a certain time (Tt), wherein the obstacle access prevention controller determines a start of the obstacle access prevention control based on the future position estimated by the future position estimator, characterized by an overtaking state detector for detecting an overtaking state which is at least one of a first state where the own vehicle is overtaking the obstacle detected by the side obstacle detector and a second state where the own vehicle is estimated to overtake the obstacle; a control suppressor, when a determination that the overtaking state is established is made based on the detecting by the overtaking state detector, for suppressing the obstacle access prevention control compared with when the determination that the overtaking state is established is not made, wherein when the determination that the overtaking state is established is made based on the detecting by the overtaking state detector, the control suppressor suppresses the start of the obstacle access prevention control by the obstacle access prevention controller compared with when the determination that the overtaking state is established is not made, to thereby suppress the obstacle access prevention control. a side obstacle detector for detecting an obstacle present in an obstacle detection area (K-AREA), with at least a posterolateral direction of an own vehicle as the obstacle detection area (K-AREA); an obstacle access prevention controller for implementing an obstacle access prevention control which assists an access prevention for preventing the own vehicle from accessing the obstacle detected by the side obstacle detector; a future position estimator for estimating a future position which is a position of the own vehicle after a certain time (Tt), wherein the obstacle access prevention controller determines a start of the obstacle access prevention control based on the future position estimated by the future position estimator, characterized by an overtaking state detector for detecting an overtaking state which is at least one of a first state where the own vehicle is overtaking the obstacle detected by the side obstacle detector and a second state where the own vehicle is estimated to overtake the obstacle; a control suppressor, when a determination that the overtaking state is established is made based on the detecting by the overtaking state detector, for suppressing the obstacle access prevention control compared with when the determination that the overtaking state is established is not made, wherein when the determination that the overtaking state is established is made based on the detecting by the overtaking state detector, the control suppressor suppresses the start of the obstacle access prevention control by the obstacle access prevention controller compared with when the determination that the overtaking state is established is not made, to thereby suppress the obstacle access prevention control.