Abstract: A mobile terminal device including: an ultraviolet LED unit for irradiating an object with ultraviolet rays of a wavelength between 200 nm or more and less than 400 nm; an image sensor unit for capturing, as a ultraviolet irradiation region, the ultraviolet rays irradiated from the ultraviolet LED unit, an image sensor part for converting into image data the ultraviolet irradiation region captured by the image sensor unit; and a display and touch panel unit for displaying, as image information, the ultraviolet irradiation region converted into image data by the image sensor part.