This invention relates to a rectum examination device capable of connecting to an endoscope with an image capture element. A property of an extracted mark from a document is compared to the properties of the existing clusters. The angle of inclination of the shading plate is controlled based on an image signal supplied to the optical modulation device, thereby enabling adjustment of the amount of light. An adjustment member is coupled between the torsion spring and a headband arm and is operable for adjusting the torsion force of the torsion spring to adjust the torsion force on the arms. The last media storage device is prevented from deleting the particular segment of the media file until another of the multiple storage devices stores a copy of the particular segment of the media file. Then, the outer jacket holding member and securing member secure the outer jacket and tension-resistant fiber to the rear housing, and the boot is mounted to the securing member.