To provide joints for connecting pipe arrangement, which permit attaching or removing piping quickly and easily.

This joint for connecting pipe arrangement comprises an indoor side coupling unit 2 with the ends of a plurality of pipes 4a concentrated and an outdoor coupling unit 3 arranged in concentration with the ends of pipes to be connected 4b to the piping 4a, mutually being arranged as detachable connector construction. Then, when the indoor side coupling unit 2 and the outdoor side coupling unit 3 are coupled together, the piping 4a is jointed to the pipes to be connected 4b.