A device (10, 36, 39) for rolling up and unrolling a leash, especially for leading an animal, includes a leash roller (11) and a blocking device (22), which has an actuating element (37) and a locking element (26). The leash roller (11) can be actuated by the blocking device (22) for blocking an unrolling motion of the leash roller (11). The actuating element (37) can be actuated by an actuation motion. A locking motion of the locking element (26) can be triggered for blocking the unrolling motion of the leash roller (11) based on the actuation motion of the actuating element (37). Generation of a disturbing noise, with the blocking device, is avoided by the actuation motion of the device (10, 36, 39) being transferred by a transfer device (23) into a locking motion of the locking element (26) that is greater than the actuation motion.