To provide a locking device unlocking an automatic vending machine with no intensive force required and with excellent crime preventing properties.

This locking device of an automatic vending machine includes the main body of the vending machine, a door which is supported by the main body of the vending machine in a freely opening/closing way and can open and close the front face of the main body, a latch mechanism 4 which is provided in one of the main body of the vending machine or the door and an engagement member 5 which is provided in the other of the main body or the door and is engaged with the latch mechanism 4. Then plural members 5 are prepared together with plural latch mechanisms 4 corresponding to the members 5, and each of these mechanisms 4 is engaged with its corresponding member 5 respectively.