Driving Assistance Method and Driving Assistance Device

A driving assistance method for performing a lane change of an own vehicle by an automated lane change function causes a controller to perform processing including: when a vehicle permitted to travel in, of a first lane and a second lane, the first lane is limited, the first lane and the second lane being a plurality of lanes on a road on which the own vehicle travels, the plurality of lanes being adjacent to each other and having a same travel direction, determining whether or not the own vehicle is traveling in the first lane in which a vehicle permitted to travel in the first lane is limited; and when determining that the own vehicle is traveling in the first lane, not performing a lane change from the first lane to the second lane by the automated lane change function.