The invention is provided with: a camera support tube (13) one end part of which is introduced into a body a camera unit (11) which is joined to the camera support tube inside the body a support tube joining portion (14) which joins the camera unit and the camera support tube a camera-side cable (12) which is connected to the camera unit and led out to an outside of the body through the camera support tube and a control system that is provided outside the body is connected to the camera-side cable, and includes at least a display (18).
