Abstract: An anti-theft device for motor vehicles of the kind having a gearshift lever and a handbrake lever mounted on the floor in line with each other, consists of a tubular member open at its bottom which is to be fitted over the handbrake lever, and a bi-furcated member which is to be pressed onto the gearshift lever. The bi-furcated member includes two bars which are slidingly fastened in two bores at the ends of an axle which is rotatably mounted in the upper end of the tubular member and which can be locked in any position by a tooth pushed upwards by a lock in the tubular member by entering a space between two teeth of a gear on the axle. The two bars are recessed by grooves in their sides facing each other which can be engaged by two coaxial pins in the axle, which are pressed into a pair of grooves by the same lock and can be pushed inwardly of the axle after unlocking.