To provide a lock device including a hook mounted on a door rotatably fitted to an opening of a cabinet to close the opening, and a lock mechanism body provided on an opening side of the cabinet in a manner of engageable with and disengageable from the hook so that rotation of the door, in its state of closing the opening, in the opening direction may be inhibited when being engaged, by which the cost is lowered and the time and labor for mounting is reduced.

A opening mechanism 5 pushing the door in its locked state in the opening direction when the lock of the lock device is released is incorporated in the lock mechanism body 3.