To provide a criminal action preventing device for a pachinko game machine capable of appropriately preventing a criminal action.

The criminal action preventing device for the pachinko game machine 1 is provided with a criminal action detection for detecting criminal external factor caused from the front surface of the pachinko game machine 1 and an emergency disconnection device for disconnecting the electrical connection of the pachinko game machine 1 and a main power source in the case that the criminal action detector detects the criminal external factor. Thus, in the case that the criminal external factor is caused, the continuance of a game in the pachinko game machine 1 is disabled, the criminal action is appropriately prevented and influence by the criminal external factor does not remain in a game control system further. Also, a person in charge in a game parlor is not required to immediately give a warning at the time of finding the site of the criminal action and can perform the work of restoration or the like for the pachinko game machine 1 after confirming safety.