In an image forming apparatus, when a first state (which allows a process of accepting a job involving image processing) continues over a shift timer period without reception of an execution request for the job, a state control part performs an operation of shifting from the first state to a second state (which is lower in power consumption than the first state). Moreover, in a case where job acceptance started in the second state on the basis of a first execution request is failed and job acceptance started in the second state on the basis of a second execution request is also failed, the shift timer period is extended on the basis of a differential value of a difference between a first execution request reception time and a second execution request reception time, and a third execution request for the job in the first state is awaited.