PURPOSE: To enhance workability by installing one end of an arm movably on a support and installing a main body, which installs a camera movably, to the other end of the arm and a remote control unit which controls the main body in remote control mode.

CONSTITUTION: A main body is suspended in such a fashion that a support member 1 may be positioned at an upper inlet hole while a camera 3 may be positioned at a lower inlet hole. Then, a hydraulic cylinder 13 is operated by the remote control of a remote control unit and an expansion X-arm 12 is expanded while a pushing plate 11 is pushed against the inner wall of the upper inlet hole, thereby holding the support unit 1 on the inner wall of the upper inlet hole. Then, when a motor 18 is started in remote control mode and an arm 2 is turned with the rotary motion of a motor shaft 18a and bent with a hydraulic cylinder 25. A camera rack 32 is turned by starting a motor shaft 33 of the camera 3 in remote control mode while it is vertically moved with a hydraulic cylinder 26. Furthermore, a motor in the camera rack 32 is started so that a camera 31 may be turned with the rotary motion of the motor shaft 33. After it is positioned, the inner wall is photographed.