| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe connection structure which is more improved in the metal touch effect than that an embodiment of a prior art having a completely flat contact, and capable of using a soft sealing body less in damages. SOLUTION: This pipe connection structure comprises a connection member 1, a nut 13 and a pipe 18, the connection member 1 has a first conical hole 5, a hole is continuous thereto, a screw part 3 is provided, the nut 13 is provided with a second conical hole 15 and a through hole 17, the pipe 18 has a first conical tension surface 22, a connection part 21 is formed, a third conical angle 23 is larger than the first conical angle 11 and its length 32 in the axial direction is smaller than 15% of the length 9 in the axial direction of the first conical hole 5, the connection part 21 has a second conical tension surface 25, and an extended annular recess 28 is disposed inside in the radial direction of the first conical tension surface 22.
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