An image forming apparatus that incorporates two job executing modes of: a usual mode for executing a job at a predetermined usual processing speed; and a quiet-sound mode for raising quietness during a time of executing a job by executing the job at a quiet-sound processing speed slower than the usual processing speed, comprising: a job executing portion which is configured to execute a job at the usual processing speed in the usual mode and to execute a job at the quiet-sound processing speed in the quiet-sound mode; a mode setting portion which is configured to set in which one of the job executing modes of the usual mode and the quiet-sound mode to execute a job; and an operating portion which is configured to accept an operation for setting the job executing mode; wherein: during at least one period of a job executing period when an executing target job is under execution and a job standby period when the executing target job is on standby, the operating portion is configured to accept a job unit setting operation for setting, in a unit of the executing target job, the job executing mode of the executing target job that is at least one job of a job under execution and a standby job; when the operating portion accepts the job unit setting operation, the mode setting portion is configured to set the job executing mode in the unit of the executing target job based on the job unit setting operation accepted by the operating portion; the job executing portion is configured to execute a job in the job executing mode set by the mode setting portion; the operating portion includes a display portion provided with a touch panel; characterized in that said operation portion is configured to make the display portion display a mode setting key that has a usual mode key for performing setting or changing to the usual mode and a quiet-sound mode key for performing setting or changing to the quiet-sound mode during at least one period of the job executing period and the job standby period, and to accept an operation for touching the mode setting key as the job unit setting operation; when the job unit setting operation is performed on the mode setting key, if the usual mode key is an operation target, the mode setting portion sets the job executing mode of the executing target job to the usual mode, and if the quiet-sound mode key is an operation target, the mode setting portion sets the job executing mode of the executing target job to the quiet-sound mode; and when the operating portion accepts the job unit setting operation, the mode setting portion identifies the executing target job that is a target for the job unit setting operation, and if the executing target job that is the target for the job unit setting operation is the job under execution, the mode setting portion stops the executing target job temporarily and, after setting or changing the job executing mode of the executing target job that is the target for the job unit setting operation, the main control portion resumes the executing target job at a processing speed that corresponds to the set or changed job executing mode, wherein during at least one period of the job executing period and the job standby period, the operating portion displays a job executing situation screen (SS1, SS2) that indicates an executing situation of the executing target job and displays the mode setting key in the job executing situation screen (SS1, SS2). a job executing portion which is configured to execute a job at the usual processing speed in the usual mode and to execute a job at the quiet-sound processing speed in the quiet-sound mode; a mode setting portion which is configured to set in which one of the job executing modes of the usual mode and the quiet-sound mode to execute a job; and an operating portion which is configured to accept an operation for setting the job executing mode; wherein: during at least one period of a job executing period when an executing target job is under execution and a job standby period when the executing target job is on standby, the operating portion is configured to accept a job unit setting operation for setting, in a unit of the executing target job, the job executing mode of the executing target job that is at least one job of a job under execution and a standby job; when the operating portion accepts the job unit setting operation, the mode setting portion is configured to set the job executing mode in the unit of the executing target job based on the job unit setting operation accepted by the operating portion; the job executing portion is configured to execute a job in the job executing mode set by the mode setting portion; the operating portion includes a display portion provided with a touch panel; during at least one period of a job executing period when an executing target job is under execution and a job standby period when the executing target job is on standby, the operating portion is configured to accept a job unit setting operation for setting, in a unit of the executing target job, the job executing mode of the executing target job that is at least one job of a job under execution and a standby job; when the operating portion accepts the job unit setting operation, the mode setting portion is configured to set the job executing mode in the unit of the executing target job based on the job unit setting operation accepted by the operating portion; the job executing portion is configured to execute a job in the job executing mode set by the mode setting portion; the operating portion includes a display portion provided with a touch panel;