A locking structure applied on a board sliding in a track. The board has locating hole. The locking structure includes a moving member and a locking plate respectively disposed on the board. The moving member has a pull ring portion, a first extending arm, a second extending arm, a first contact portion and a second contact portion. The locking plate has a first engaging arm and a second engaging arm, wherein the first engaging arm leans against the first contact portion and the second engaging arm leans against the second contact portion when a loading is applied to the moving member via the pull ring portion to push the moving member from an initial position to a disengaging position. The first extending arm and the second extending arm apply a resilient force to drive the moving member from the disengaging position back to the initial position.