There is provided an image forming apparatus including: an image forming portion, an accepting portion accepting print jobs and identification information associated with the print jobs, a storage portion storing the print jobs and the identification information, an identification information input portion, and a controller. The controller is configured to: cause the storage portion to store an acceptance time at which the accepting portion accepts each of the print jobs, authenticate the identification information, extract the print jobs associated with the authenticated identification information from the print jobs stored in the storage portion, acquire a difference time which is a difference between an authentication time of authenticating the identification information and an acceptance time of accepting the extracted print jobs, and cause the image forming portion to carry out image formation for all the print jobs with the acquired difference time within a first time period.