To provide a core heat insulation pipeline, an auxiliary heat transfer structure and a pipe body having a U-shaped pipeline of annular distribution capable of reducing thermal resistance and suppressing the thermal resistance by means of an auxiliary heat guiding structure disposed on the outside of a heat insulation device of a heat insulation pipe.

Pipe segments of both sides of U-shaped fluid pipeline inlet edge and outlet edge of a U-shaped pipe which transmit radiative heat energy to each other or either one side pipe segment is formed with heat insulation material. Otherwise, a heat insulation structure is installed between both edges. Further, by installing a heat transfer columnar body produced with heat transfer material, when fluid having a temperature difference flows between pipe segments adjacent to each other on the same side and having a temperature difference of fluid inlet edge and a pipe segment of fluid outlet edge flows, a temperature difference energy loss generated by heat transfer is prevented. By installing an auxiliary heat transfer structure (110) constituted with heat transfer material on an external part of a heat insulating device (400), thermal resistance formed on an internal part of the columnar heat transfer body (300) due to the heat insulation device (400) is suppressed.