To provide a piping supporting structure which is capable of utilizing a space in a pit to strongly restrict and fix a piping, and stably supporting even a long pipeline extending between the pits of a shield tunnel.

With the supporting structure 10, a base 11 is provided in a pit of a shield tunnel, and a fixing pipe 12 with a thick-wall part 12a having a larger outside diameter than the outside diameter of a piping 6 is connected to a part of the piping 6. The thick-wall part 12a of the fixing pipe 12 is covered and restrained with split type supporting members 13, 14 in front and in the rear of it, and flange parts 13a, 14a provided at the split type supporting members 13, 14 are structured to be fixed by plural fixtures 15. By this construction, the shoulder part of the thick-wall part of the fixing pipe is fixed by the split type supporting members even when pipe-reactive force is produced in the piping, and the shoulder part can be fixed by the integrated split type supporting members or the whole split type supporting members.