PURPOSE: An inspection device is provided for inspecting an interior of stream generators capable of visually inspecting an interior of a tube. CONSTITUTION: The inspection device (1) for inspecting the interior of steam generators (4) capable of visually inspecting interior of tubes (79) in steam generators, includes an upper portions steam generator tubes (79), a tops and bottoms of support plates (15), wrapper-to-support plate welds, and other internal structures.
