DRIVING ASSISTANCE METHOD AND DRIVING ASSISTANCE DEVICE

Provided are a driving assist method and a driving assist device with which travel in a passing lane can be prevented from continuing for longer than anticipated. [0002] The present invention is a driving assist method carried out by a lane change controller (40) that executes a lane change assist in which a lane change made by a host vehicle (V) is assisted on the basis of a generated target travel route, wherein upon determining that the host vehicle (V) is traveling in a road which has a plurality of lanes and in which a lane change can be made, determining whether or not the host vehicle (V) is traveling in a first area (X) where an autonomous lane change can be executed. Next, upon determining that the host vehicle (V) is traveling in the first area (X), determining whether or not the host vehicle (V) is traveling in a predetermined range from an area border (α), which is a boundary between the first area (X) and a second area (Y) where the autonomous lane change cannot be executed. Upon determining that the host vehicle (V) is traveling in a predetermined range from the area border (α), control for the autonomous lane change is performed so that the host vehicle (V) travels in a traveling lane (L2).