Lane departure prevention apparatus

A lane departure prevention apparatus is configured to conduct a course correction in a lane departure avoidance direction when a controller(8)determines that there is a potential for a vehicle to depart from a driving lane. The lane departure prevention apparatus has a driving road detecting section (13 or 15) and a lane departure avoidance control section (steps S2 to S6). The driving road detecting section (13 or 15) is configured to determine at least one of a road slope direction and a road curvature direction of a driving road upon which a host vehicle is traveling. The lane departure avoidance control section (steps S2 to S6) is configured to start lane departure avoidance control based on a driving direction of the host vehicle and at least one of a road slope direction and a road curvature direction detected by the driving road detecting section (13 or 15).