Patent ID: 7705873

Claim:
An image forming apparatus, comprising: an image forming unit that forms an image on a recording sheet; a casing that encloses the image forming unit and that has an ejection port configured to eject the recording sheet on which the image are formed; an ejection tray that stacks recording sheets ejected from the ejection port; a main frame side connector configured to electrically connect to an external device, the main frame side connector connectable to an external device side connector provided in the external device while at least a part of the external device is disposed outside the casing; and a supporting member that displaceably supports the main frame side connector with respect to the casing, the main frame side connector being supported by the supporting member so as to be rotatable with respect to the casing; wherein the main frame side connector is displaceable between a protrusion position and a retraction position while being connected with the external side connector, the protrusion position where the at least a part of the external device protrudes from the main frame side connector to outside of the casing, the retraction position where a portion of the external device protruding outward from casing is retracted from the protrusion position towards a side of the main frame; wherein the supporting member displaceably supports the main frame side connector in a vertical direction; and the supporting member has a center of gravity located at a position where gravity is applied so that the main frame side connector is faced to the protrusion position.