Lock mechanism for electronic device

A lock mechanism configured to be disposed in an electronic device is provided, including a first lock element, a recovering element, a balancing element, and a second lock element. The first lock element has a lock portion and is disposed in a first body of the electronic device along a moving axis in a sliding manner. The recovering element is disposed between the first lock element and the first body and supplies a recovering force along the moving axis. One side of the balancing element is lodged into the first body, and the other side is lodged into the first lock element. The second lock element is disposed on the second body of the electronic device, and lodged into the lock portion. The balancing element ensures that the first lock element moves smoothly along the moving axis without deviation.