An image forming apparatus equipped with a processing apparatus which requires a warm-up operation of a predetermined time and performs a predetermined processing to an image-formed sheet includes: a control section to specify whether each of a plurality of input jobs is a first job requiring the processing by the processing apparatus or a second job performing no processing by the processing apparatus, and to determine an execution order of the jobs so that a plurality of first jobs are successively executed when the first jobs are input in addition to the second job; and an image forming section to sequentially execute the jobs in accordance with the execution order of the jobs which is determined by the control section.