To obtain an image forming apparatus with break positions that is easily recognized at a glance for printed matter in a stacked state without impairing the original information communicating function.

A job receiving section 51 receives jobs regarding image formation along with the number of jobs and the processed number of sheets for each job. A break necessary/unnecessary determination section 53 determines whether or not a break identifier is necessary based on the number of jobs and the processed number of sheets for each job regarding the image formation received at the job receiving section 51. A break identifier image data generating section 57 generates image data regarding the break identifier taking into consideration that the image of the break identifier is formed on rectangular paper which is positioned in the breaking portion between a plurality of unit printed matter and at least on one or more corners of the four corners of the paper when the break identifier is determined to be necessary.