PURPOSE: To facilitate the rentable ratio of a building or the like by easily arranging high density piping and by easily miniaturizing the pipe shafts.

CONSTITUTION: More than one of upper cylindrical sleeves 20 are provided in a box-like body 2 formed therein with a filling space 35 so as to make the filling space 35 communicate with the outside of the body 2, and lower cylindrical sleeves 21 are provided in the body 2 so as to make the filling space 35 communicate with the outside of the body, and to be vertically opposed to the upper cylindrical sleeves 21. Further, the body 2 is formed with a filling hole 17 through which a sealing material is filled into the space 35, thereby a joint fixture 1 is constituted.