PURPOSE: To provide a burglary prevention device, particularly a burglary prevention device capable of discharging outside a fluid containing an adhesive substance, upon suffering from an illegal damage.

CONSTITUTION: This burglary prevention device has a lock device 11 and a joint member 12 with both ends 12a and 12b connected thereto and at least one of the ends 12a and 12b releasable therefrom. A fluid containing an adhesive substance is contained in the member 12, and discharged outside, when the member 12 is damaged. As a result, the substance adheres to an external material. Thus, the detection of the substance can identify a person responsible for the damage as well as the fact that the lock device 11 was locked initially.