An automatic driving control device performs an automatic driving control for causing a vehicle to travel along a reference travel trajectory set in a lane in advance. The automatic driving control device reflects the steering by the driver during the automatic driving control in the travelling of the vehicle in a case where the steering by the driver is detected during the automatic driving control by the steering detection unit and when a position of the vehicle in the lane width direction is included in an allowance range, and alerts the driver to the travelling of the vehicle in a case where the steering by the driver is detected and in a case where it is determined that the position of the vehicle in the lane width direction is included in the second range.