PROBLEM TO BE SOLVED: To provide an inner face photographing device capable of reliably performing photographing even when used in an environment having high temperature, humid, and dust.SOLUTION: An inner face photographing device performs the photographing of the inner surface of an object facing the inner space of the object along a retractable direction to the inner space of the object, and includes: an irradiation part 10 having a light source part for emitting light source light, for irradiating the light source light emitted from the light source part toward the inner surface of the object by converting the light source light into radial irradiation light a photographing part 20 having a photographing device for continuously photographing along the retractable direction of the light-sectioning plane of the inner surface of the object irradiated by the irradiation light and air purge means for spraying a purge air on the external surface of the irradiation part 10.
