Extended operation device and image forming apparatus

An extended operation device configured to be mountable to and demountable from an apparatus body, the apparatus body including a recording medium ejection device and a body-side operation device mounted thereto, the recording medium ejection device configured to eject a recording medium on which an image has been formed onto an ejection tray, and the body-side operation device having a first lateral side and a second lateral side separated in a length direction of the body-side operation device with the first lateral side of the body- side operation device being closer to the recording medium ejection device than the second lateral side of the body-side operation device, the extended operation device comprising:

• an extended operation device body;
• an input device;
• a pair of insertion portions extending in a first direction parallel to an operation surface of the input device with respect to the extended operation device body;
• and
• at least one hook extending in the first direction between the pair of insertion portions,
• wherein one insertion portion and the other insertion portion of the pair of insertion portions are provided on one side and the other side, respectively, of the extended operation device body with respect to a central position of the extended operation device body in a second direction that is parallel to the operation surface of the input device and intersects the first direction, and
• wherein the pair of insertion portions are configured to be inserted into a pair of insertion holes provided in second lateral side of the body-side operation device to mount the extended operation device to the second lateral side of the body-side operation device with the extended operation device offset from the ejection tray.