Image forming apparatus and processing unit

An image forming apparatus comprising:

• a main unit including an image forming portion configured to form an image on a sheet;
• a discharge portion provided on the main unit and configured to discharge the sheet from the main unit in a first direction;
• and
• a processing unit installed on an installation surface of the main unit and configured to process the sheet discharged from the discharge portion,
• wherein one of the main unit and the processing unit includes:
• a first connector electrically connected to the main unit;
• and
• a first guide pin that extends in a second direction crossing the first direction in a state where the processing unit is installed on the installation surface,
• wherein the other of the main unit and the processing unit includes:
• a second connector disposed, in the second direction, on a first side with respect to a sheet discharging position onto which the sheet is discharged from the discharge portion, the second connector being electrically connected to the first connector in a manner that the first connector is inserted into the second connector along the second direction;
• and
• a first guide hole disposed on the first side with respect to the sheet discharging position in the second direction, the first guide pin passing through the first guide hole, and
• wherein at least a part of the first guide pin is disposed in a position different from a position of the second connector in a third direction crossing both the first direction and the second direction.
• wherein the main unit further includes:
• a connector disposing surface on which the second connector is disposed, the connector disposing surface being disposed on the first side with respect to the sheet discharging position in the second direction, and
• a discharge portion disposing surface on which the discharge portion is disposed,
• wherein the installation surface, the connector disposing surface, and the discharge portion disposing surface define an inside space that includes an opening portion on a second side opposite the first side with respect to the sheet discharging position in the second direction, and
• wherein the processing unit is installed in the inside space.