To improve operability so that one time operation can release a lock even when a lock mechanism is added.

This device is a burglar prevention device for an automatic vending machine that has a lock mechanism for enabling a case 2 for composing a body of the automatic vending machine and the door 3 provided on a front side of the body of the automatic vending machine to be locked to each other under a condition in which the door is closed, and consists of (A) the first lock mechanism in which the lock mechanism is provided between the case 2 and the door 3 and to lock and unlock are possible by an operation at a key operation part provided to the door and (B) the second lock mechanism 5 in which the lock mechanism is provided on the side face between the case 2 and the door 3 and is unlocked linked with an operation of the first lock mechanism.