Image capturing device and image capturing system

An image capturing device comprising:

• a main body including a base end and a leading end, being formed in a hollow columnar shape having a wall defining a housing space within an inner surface of the wall, the main body having a prescribed length between the base end and the leading end, and wherein in use, a longitudinal direction of the main body is configured to be located along a direction of insertion into an oral cavity to enable at least the leading end to be inserted into the oral cavity;
• one or more light sources configured to apply light having a prescribed frequency band toward the oral cavity, the one or more light sources being disposed at the base end of the main body or inside the main body, the light being guided within the wall from a position adjacent to the base end toward the leading end of the main body;
• a grip configured to be grasped by a user, the grip being formed in an approximately columnar shape having a prescribed length, the grip elongating from the base end of the main body along the longitudinal direction of the main body, the grip and the main body being disposed on an identical straight line;
• a camera disposed in the housing space of the main body and facing in a direction along the longitudinal direction of the main body, the camera being configured to capture a subject image based on reflected light applied from the one or more light sources and reflected on the oral cavity, the camera and the main body being disposed on the identical straight line;
• and
• a display configured to display the subject image captured by the camera, the display being disposed on a side of the grip opposite to the base end of the main body, the display and the main body being disposed on the identical straight line.