| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for preventing a key from being left inserted, usable for a vestibule door or the like of a house and usable being simply mounted to the key although many devices for preventing the key from being left inserted, have been invented in the field of the ignition key of an automobile, but they are intended for the prevention of shutting up inside due to the key being left inserted. SOLUTION: The state of the key being left inserted is transmitted by sending a radio signal from a transmitter part mounted to the key, to a receiver part installed indoors or the like, and an alarm is generated at the receiver part to inform a user.
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