To provide a separation preventive implement for an existing automatic closing hinge, which can easily and inexpensively take conversion measures against separation of a movable blade of the hinge from a fixed blade.

The separation preventive implement 13 for use in combination with the automatic closing hinge, has a base plate 14 which is pinched by the fixed blade 2 and a fixed frame body 1, and fixed to the fixed frame body 1. The base plate 14 has a stopper plate 15 extending therefrom at an upper end thereof, which is located in an upper space of the movable blade 4 when a door is closed. Thus the stopper plate 15 is arranged at a location that does not interfere with the movable blade 4 during opening operation of the door.