An upper column cover includes a final positioning part, an initial positioning part, and a guide part. The final positioning part positions a camera in a state where the camera is arranged at a final assembly position at which a lens of the camera is arranged in an opening. The initial positioning part positions the camera in a state where the camera is arranged at an initial assembly position at which the lens of the camera is separated from a top wall portion and a suspended wall portion. The guide part guides the camera in a process in which the camera is moved from the initial assembly position to the final assembly position while regulating a movement of the lens of the camera in upward, downward, rightward, and leftward directions with respect to the upper column cover.