The image forming unit 11 includes a roller member that guides the continuous feed paper P along a transport path 16, and a droplet ejection device 17 that ejects droplets to the continuous feed paper P transported along the transport path 16 to form an image. In this exemplary embodiment, a so-called ink-jet system is adopted as the print method.

The droplet ejection device 17 includes a droplet ejection head 17K that forms a black image by ejecting ink droplets to the continuous feed paper P, a droplet ejection head 17Y that forms a yellow image, a droplet ejection head 17M that forms a magenta image, and a droplet ejection head 17C that forms a cyan image. The droplet ejection head 17K, the droplet ejection head 17Y, the droplet ejection head 17M, and the droplet ejection head 17C are disposed in this order from the upstream side toward the downstream side in the transport direction. As a matter of course, the droplet ejection head 17K, the droplet ejection head 17Y, the droplet ejection head 17M, and the droplet ejection head 17C are disposed to face the continuous feed paper P being transported.

In the following description, symbols K, Y, M, and C that accompany the reference numeral are omitted if no distinction is made among K, Y, M, and C.

A drying drum 18 is disposed downstream of the droplet ejection head 17C in the paper transport direction. The drying drum 18 dries the image formed on the continuous feed paper P while rotating in the following manner in contact with the continuous feed paper P being transported with the back surface of the continuous feed paper P wrapped around an outer peripheral surface 18A of the drying drum 18.