Image forming apparatus incorporating automatic coupling device

An image forming apparatus comprising:

• a housing;
• an image forming device housed in the housing;
• an image reading device coupled with the housing at a rear end of the housing via a first hinge and switchable between an overlapping state overlapping the housing and a standing state standing at the rear end of the housing, the image reading device configured to read an image on an original document;
• an automatic document feeder disposed coupled with the image reading device at a rear end of the image reading device via a second hinge and switchable between an overlapping state overlapping the image reading device and a standing state standing at the rear end of the image reading device, the automatic document feeder configured to turn the original document and convey the original document to an image position;
• and
• an automatic coupling device disposed across the image reading device and the automatic document feeder and configured to couple the automatic document feeder and the image reading device with each other when the image reading device is opened in a state in which the automatic document feeder is overlapped on the image reading device.