| 摘要 |
PROBLEM TO BE SOLVED: To prevent an illicit unlocking and the breakage of a key by picking to improve the crime preventive property. SOLUTION: This keyhole blocking device 31 for blocking a keyhole by being inserted to the keyhole of a lock device and engagingly locked with the keyhole comprises a keyhole installation part 37 having a locking part 45 to be locked to the keyhole at the tip side, which is engagingly locked with a tumbler within the keyhole by being inserted to the keyhole so as to be non- drawable from the keyhole, and a locking release mechanism 39 for releasing the locking of the locking part 45 to the keyhole by the combination of numbers that is a special operation, which is provided on the base end of the keyhole insertion part 37 arranged out of the keyhole.
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