To prevent any damage to a keylock due to malicious mischief by employing a completely new kind of keylock mechanism which has no key hole in the lock mechanism.

Permanent magnets are arranged in a key; small balls are floated inside a case of the lock; holes into which the small balls can enter are provided deep inside with the arrangement same as that of the permanent magnets; a slide lock can be disengaged when the arrangement of the magnets coincides with the positions of the small balls and holes and the inner slide can be moved by 10 mm approximately; and the lock mechanism at the door side can be operated when pushing and rotating a gear rotating shaft.