To provide a pipe connection part, a valve, a pipe coupling and a refrigerating unit using the same, for preventing anybody from easily loosening a threadedly engaging part or removing a pipe by loosening the threadedly engaging part, after connecting the pipe.

This pipe connection structure is provided for fastening a joining member 2 to a coupling body 1. The joining member 2 is divided into two parts of the pipe connection part 23 threadedly engaged with the coupling body 1 by a disk-like slit 22 having a cut line in the radial direction and a gripping part 24 graspable by a general fastening tool, and both are connected by a tubular connection part 27. The gripping part 24 is separated from the pipe connection part 23 by dividing the tubular connection part 27 in a process of connecting the pipe, and is also covered with a cover 52 in a state of being out-fitted to the pipe P after being separated.

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