To improve a piping workability on a job site by making plural pipings such as a gas piping and water supply piping altogether to a piping unit used to the enforcement of a piping for housing, holding pipe end connectable plural pipings by a support member at both ends and fixing to a piping enforcement place by the support member.

A piping unit A is composed by holding, for example an additional burning piping 10, a water supply piping 20, a gas piping 30 and a hot water piping 40 altogether to a support member 50 and piping joint parts 10a-40a for joint are provided in a flush state in one end side of respective pipings. The other end side of the additional burning piping 10 is bent and a flange 10b is provided on its former pipe end. While, a water supply header 60 which is a header for branching is provided on the side near to the piping joint part 20b of the pipe end of the water supply piping 20 and in the hot water piping 40, a hot water header 70 is provided on the side near to the piping joint part 40b alike. The straight parts of these pipings 10-40 are mutually parallel and maintained by the support members 50 of four places altogether.