Abstract: A lock mechanism for use in the glovebox door of an automobile including a lock-bar held by a guide of a main body for sliding motion in the vertical direction, a hook projecting from the guide and a striker disposed within a space defined by the lock-bar and the hook. The lock-bar and the guide are respectively provided with an elongated through aperture extending in the vertical direction and passing through in the horizontal direction. A locking plate extends through these through apertures with one end thereof engaging with a crank provided on a rotor of a cylinder type safety lock. The other end of the locking plate is engaged by a pawl of a pull-handle of the glovebox door when the cylinder type safety lock is put in the unlocked position, while the other end being disengaged from the pawl when the cylinder type safety lock is put in the locked position.