DRIVING ASSISTANCE METHOD AND DRIVING ASSISTANCE DEVICE

A driving assistance device (1) includes: a sensor (camera 10) configured to detect an object in front of a host vehicle; and a controller (20). The controller (20) sets a detection range of the sensor (camera 10), and when the host vehicle is stopped, the controller (20) extends the detection range in a vehicle width direction as compared with when the host vehicle is traveling following the preceding vehicle.