INNER SUBPIPE JOINT AND MANHOLE OR BASIN USING THE JOINT

PROBLEM TO BE SOLVED: To provide an inner subpipe joint which can be applicable to a plurality of manholes or basins having different sizes.SOLUTION: An inner subpipe joint 10 having a joint body 12 is attached to an inner wall 102 of a manhole 100 so as to prevent a bottom surface 108 of the manhole 100 from being abraded or damaged by the fall of inflowing sewage water from a high place and to prevent scattering of the sewage water. The joint body 12 is formed of a flexible synthetic resin and includes a sewage water receiving part 14 which receives the sewage water flowing from an inflow pipe 104 and a vertical pipe part 16 for connecting an inner subpipe 120. The sewage water receiving part 14 comprises a first pipe wall 18 which is disposed adjacent to the wall surface side of the manhole 100 and a second pipe wall 20 disposed adjacent to the center of the manhole 100, and has a funnel shape with an upper opening. The flexible first pipe wall 18 can be deformed along the inner wall surface of a plurality of manholes having different sizes.