Image forming apparatus

An image forming apparatus, comprising:

• an apparatus main body having a casing structure and adapted to perform an image forming operation;
• a sheet receiving surface constituting a part of the casing structure and adapted to receive a sheet discharged after an image forming process is performed in the apparatus main body;
• a window provided on the sheet receiving surface for enabling a part of the interior of the apparatus main body to be seen;
• and
• an auxiliary tray attached to the sheet receiving surface and displaceable between an unfolded position to auxiliary support a discharged sheet and an accommodated position to be accommodated in the sheet receiving surface,
• wherein:
• the window is provided at a bottom surface of a recess formed by recessing a part of the sheet receiving surface, and
• the auxiliary tray is accommodated in the recess when being located at the accommodated position and includes a transparent portion for ensuring the visibility of the window.