Abstract: A locking device adapted for use to lock the hand brake and gear shift of a car includes a main shaft which is a tubular structure having a lock element disposed at one side near its front end and a lock bar extending from the side and defining a check space with the main shaft, and a movable shaft which is a rod structure having a plurality of teeth at one side thereof, one end of the movable shaft being a pointed portion while the other end thereof being connected to a cap. The movable shaft is inserted into the main shaft with the lock element engaging with the teeth of the movable shaft; the space defined between the lock bar and the main shaft accommodates the gear shift and the cap is fitted on a head portion of the hand brake.