It is an object of this invention to provide a setting operation device which can effectively cope with the tendency toward multiple functions and allows a user to easily change and check functions. In order to achieve this object, the device includes a first rotating unit which is rotated/operated to select at least a first upper operation mode and a second upper operation mode, and a second rotating unit which is rotated/operated to select a lower operation mode belonging to the first upper operation mode set by the first rotating unit and a lower operation mode belonging to the second upper operation mode set by the first rotating unit, the second rotating unit being stacked together with the first rotating unit.