To provide a pipe joint which does not require preparation of all kinds of pipe joints according to structures when members of a user are connected to each other, moreover, hardly gets bulky and permits large-quantity conveyance.

The connecting structure 500 of a pipe unit 300 includes a plurality of split pipe joints 200 and fixing means 400. The plurality of split pipe joints 200 are formed by splitting the pipe joints having a plurality of openings formed therein. The fixing means 400 are communicated with each other via holes formed on the plurality of pipe units 300 and holes formed on the plurality of split pipe joints 200 and, thereby, the plurality of pipe units 300 are connected with each other.