A motor vehicle door lock comprising a locking mechanism (1, 2), an actuating lever unit (3, 4, 16), which interacts with the locking mechanism (1, 2), a drive (6, 7, 8, 9) impinging upon the actuating lever unit (3, 4, 16) and an anti-theft protection device (10, 11), wherein a buffer member (12, 13) is assigned to the actuating lever unit (3, 4, 16) and to an unlocking lever (5) which interacts with the actuating lever unit (3, 4, 16), the buffer member being controlled by the anti-theft protection device (10, 11) in accordance with the desired functional position of the locking mechanism (1, 2).