In a display control device for a head-up display mounted in a vehicle, when a lane keeping control function of driving a vehicle to travel in a traveling lane is terminated, a termination notification image to notify a driver of a termination of the lane keeping control function is generated and caused to be displayed by the head-up display. As another example, in a configuration where the operation of the lane keeping control function is continued even when one of a right road line and a left road line of the traveling lane is not detected, a continuation notification image to notify a driver of a continuation of the lane keeping control function is generated and caused to be displayed by the head-up display.