There is disclosed an articulating structure that is steered by relative movement of a plurality of segments connected in series, the articulating structure including a first segment and a second segment arranged in contact with each other, wherein contact surfaces of the first segment and the second segment are rolling contact surfaces in line contact on a first direction contact line, the first segment has a pin on a side, the second segment has a coupling hole into which the pin is inserted, the first segment and the second segment make a relative rolling movement for translation of the first direction contact line while maintaining the line contact, and the coupling hole is formed with a larger area than the pin to allow the pin to make a relative position movement within the coupling hole during the rolling movement.