To provide an X-ray image tube device including an X-ray-excited phosphor surface having high resolution and its phosphor surface.

An X-ray image tube 1 has a vacuum envelope 11, an X-ray incident window 13, and an image output surface 15. Using an evaporation source in which a first evaporative material made of CsI serving as an X-ray fluorescent material and a second evaporative material having lower evaporation steam pressure than the first evaporative material are admixed, the phosphor surface 13b of the X-ray input window 13 is formed on a substrate 13a through a low-temperature process without causing splashes toward the substrate.