A driving control device controls driving of a subject vehicle at a predetermined driving assistance level using a processor under a condition of traveling behind a preceding vehicle. The processor determines whether another vehicle is detected in a second lane when the subject vehicle traveling in a first lane at the predetermined driving assistance level changes a lane to the second lane different from the first lane, keeps the traveling of the subject vehicle in the first lane until the other vehicle is detected when the other vehicle is not detected, and executes lane-change control at the predetermined driving assistance level after the other vehicle is detected.
