To perform the image forming operation, the image forming apparatus 1 operates as follows. The image recording device 12 records an image on a sheet P, delivered from the paper feeding device 14 and transported by the paper transport device 19, on the basis of the source image data generated through the document reading operation, stored in the image memory, or received from a computer connected via a network.

The paper feeding device 14 includes a paper cassette 141. A feed roller 145 is provided on the upper side of the paper cassette 141, to feed the sheet P stored in the paper cassette 141 toward a transport route 190.

The paper feeding device 14 also includes a manual bypass tray 142, attached to a wall face of the main body 11, so as to be opened and closed. The sheet P set on the manual bypass tray 142 is delivered to the transport route 190 by a feed roller 146.

The paper transport device 19 includes the transport route 190 along which the sheet P is transported from the paper feeding device 14 to an output tray 151, a transport roller pair 191 located at a predetermined position on the transport route 190, and a discharge roller pair 192.

The sheet P delivered from the paper feeding device 14 is introduced into the transport route 190 by the transport roller pair 191. The sheet P, on which an image has been formed by the image recording device 12, is transported along an outgoing transport route 193 (part of the transport route 190) in a face-up orientation, and then discharged to the output tray 151 by the discharge roller pair 192.