Image forming apparatus

An image forming apparatus, comprising:

• a main chassis comprising a discharge tray and a switchback tray disposed in an upper position with respect to the discharge tray;
• an image forming unit configured to form an image on a recording sheet;
• a discharge roller configured to discharge the recording sheet conveyed through the image forming unit onto the discharge tray;
• a duplex conveyer configured to invert the recording sheet conveyed through the image forming unit and convey the inverted recording sheet to return the image forming unit;
• and
• a switchback roller configured to be rotatable in a normal direction and a reverse direction, the switchback roller being configured to convey the recording sheet conveyed through the image forming unit toward the switchback tray by rotating in the normal direction and to convey the recording sheet being conveyed toward the switchback tray to the duplex conveyer by rotating in the reverse direction;
• wherein the main chassis comprises a pair of walls, each of which extends in a vertical direction and in a conveying direction being a direction to convey the recording sheet by the switchback roller rotating in the normal direction toward the switchback tray, the pair of walls being arranged in adjacent to the switchback tray such that the switchback tray is interposed between the pair of walls.