An image forming apparatus includes: a plurality of output trays; a storage device that stores a table, each of the plurality of output trays and a combination of a plurality of attributes of sheets-allowed-to-be-output being registered in association with each other in the table; and a controller that receives a print request, the print request including a plurality of attributes of a sheet-to-be-printed, determines whether or not a combination of the plurality of attributes included in the print request is registered in the table, if determining that the combination is not registered in the table, selects an output tray as a tray-to-catch-output-sheet with reference to the table, at least one attribute included in the print request being registered in association with the output tray selected, and if determining that none of the plurality of attributes included in the print request is registered in the table, selects no tray-to-catch-output-sheet.