In an image forming device, left and right mounting frames are disposed on the respective left and right frames of the image forming device by hooking pawls provided on the front side thereof. The mounting frames support a paper supply roller and separating mechanism. A trigger unit is fixed inside the left frame for turning ON and OFF the driving of the paper supply roller via a gear. A multipurpose unit is swingably supported on the mounting frames by a support unit. However, when a manual feed unit is mounted in the image forming device, the left and right mounting frames and the trigger unit are not installed, but the manual feed unit is swingably supported on bearing protrusions.

 
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