Abstract: An anti-theft device for an automobile vehicle comprises a casing which is fastened to the handbrake lever so that the casing can be pivoted relative to the lever between an inoperative position allowing operation of the handbrake lever, and an operative position in which, when the handbrake lever is in the handbrake engaged position, the casing envelops and immobilizes the handbrake lever. The casing carries a two part annular component which can be closed and locked around the gear lever when the casing is in the operative position, thereby preventing operation of the gear lever as well as the handbrake lever.