To provide an image forming device and an image forming method which can selectively achieve restriction on driving of the image forming device and prevention of
delay of a timing of improving an
image quality when a normal image forming process is not executed.SOLUTION: An image forming device (100) is provided with an image forming part (3), a first image forming
processing part (51) and a second
image processing part (52). When a preliminarily set execution condition is satisfied, the second
image processing part (52) executes an image forming process for detection for making the image forming part (3) form an image for detection, which is used to adjust an
image formation condition in the image forming part (3), on a region (A3) outside a printing region in a transferred subject (26). The second
image processing part (52) starts the image forming process for detection during execution of a normal mage forming process, and then switches whether the image forming process for detection should be continued or not in accordance with a preliminarily set switching condition, when the normal image forming process is completed prior to the image forming process for detection.SELECTED DRAWING: Figure 4