The ultraviolet ray irradiation device 9 comprises the cover member 16 to
cover the ultraviolet ray light source 15, and an ultraviolet ray
reflectance of a surface which is an inner surface of the cover member 16
and reflects the ultraviolet ray radiated from the ultraviolet ray light
source 15 to the recording head 6 is made to be lower than an ultraviolet
ray reflectance of the other surface.