An image forming apparatus is provided, which includes a sheet tray disposed to face a plurality of photoconductive bodies across a belt device, and two main frames disposed to face each other across the plurality of photoconductive bodies, the belt device, and the sheet tray, the two main frames being configured such that the plurality of photoconductive bodies, the belt device, and the sheet tray are detachably attached thereto, the two main frames being further configured to define a communication section that leads from a space for accommodating the plurality of photoconductive bodies to the sheet tray.