A locking device for locking a movable vehicle roof to a vehicle roof receptacle includes a locking rail. The locking rail is supported on a side of one of the roof receptacle and the roof. The locking rail is longitudinally displaceable and executes a lifting movement in response to being longitudinally displaced. A first locking element is supported on the locking rail. A second locking element is supported on a side of the other one of the roof receptacle and the roof. The first and second locking elements lock against one another in response to the lifting movement of the locking rail such that the roof receptacle and the roof are tensioned toward one another.