An image forming device includes a residual paper amount detecting unit, a first execution unit and a second execution unit. The residual paper amount detecting unit is configured to detect a residual paper amount of a paper feeding cassette which retains papers. The first execution unit is configured to, if the number of papers required in executing an initially-inputted earliest job among a plurality of print jobs is more than the residual paper amount detected by the residual paper amount detecting unit, execute printing of a predetermined minimum number of printing papers in the earliest job. The second execution unit is configured to, after the printing of the minimum number of printing papers is executed by the first execution unit, execute one of the print jobs satisfying a predetermined priority condition.