PURPOSE: To prevent the opening of a lid for a car lift-gate by providing an intermediate lever interlocked with a lock lever on the body of a car in the case of the opening of the lid and unlocked by turning a key cylinder lever controlled through a key to a striker base.

CONSTITUTION: A key cylinder 15 and a striker 6 are provided to a lift-gate 4 side, and a lock body 30 is provided to the body 5 side to form a lock mechanism of the car lift-gate 4. After that, an intermediate lever 17 interlocked with a lock lever of a lock body 30 on the body 5 side in the case of the opening of a lid and unlocked by turning a key cylinder lever 16 controlled through a key K is provided to a striker base 3. When the key is turned clockwise when the lid is closed, the key cylinder lever 16, intermediate lever 17 and a ratchet lever 19 are turned, a ratchet 19 B is separated from an interlocking section of a disc rotor 21, and the disk rotor 21 is turned to release the striker 6.