PROBLEM TO BE SOLVED: To provide a drain basin easy in manufacture, and capable of simplifying work on laying of a drain facility by changing a position for connecting the end of a drain branch pipe in response to the position of the end of the drain branch pipe, and to provide a drain facility using the same.SOLUTION: A drain basin 10 comprises a basin body 11 and a branch pipe connection part 12, and the branch pipe connection part 12 comprises a connection cylinder 17 connected to a connection port 16 and an elbow part 18 provided on the tip of the connection cylinder 17 and connected with a drain branch pipe SD, and the connection cylinder 17 is provided with a straight pipe part extending in a straight line shape along the opening direction of the connection port 16, and the straight pipe part is used as a length adjusting part 17A for adjusting the length up to an opening center 18a on the tip of the elbow part 18 from a pipe axis At of a drain main pipe MD in a plan view.
