To enhance assembling workability by preventing damage to a tailgate outer and a tailgate inner when a link for connecting together the locking and unlocking mechanisms of a tailgate is set in the tailgate.

This structure is so formed that a locking mechanism 10 for locking a tailgate 1 to the side plate of a vehicle carrier is provided on each side of the tailgate 1 along the cross direction of a vehicle, the tailgate 1 comprising a tailgate outer 16 and a tailgate inner 17; a lock releasing mechanism 3 for releasing the lock of the tailgate 1 to the side plate achieved by the locking mechanism 10 is provided at the center of the tailgate 1 along the cross direction of the vehicle, the locking mechanism 10 and the lock releasing mechanism 3 capable of being connected together by a link 15'. In this case, only both ends of the link 15 are inserted via a service hole 17a formed in the tailgate inner 17 into a space 19 formed by the tailgate outer 16 and the tailgate inner 17, and the middle part of the link 15' is extended to the back of the tailgate inner 17 outside the space 19.