To provide an overturning preventing device for an automatic vending machine capable of easily attaching a weight even to an existing automatic vending machine in addition to an automatic vending machine to be newly installed.

The overturning preventing device for an automatic vending machine for preventing overturning of the automatic vending machine 1 respectively having screw holes 5 and 5 on both right and left sides of a back face upper part has a hook part 12 latched on a top face 1b of the automatic vending machine 1, and holes 13 and 13 facing the screw holes 5 and 5 in a latched state via the hook part 12. In a back face side of the automatic vending machine 1, a pair of right and left weight fittings 3 and 3 is arranged in a state extending in a vertical direction with a space in a horizontal direction, a fitting fixing screw 17 is provided for fixing each of the pair of weight fittings 3 and 3 to the automatic vending machine 1 by being screwed into the screw hole 5 via the hole 13, and a weight 4 is attached to the pair of weight fittings 3 and 3 such that it is extended in the horizontal direction between the fittings 3 and 3.