To provide a branch pipe joint for applying a free access method to a waved flexible pipe for communication.

A through-hole 11 is drilled in a corrugated flexible pipe 7 for communication, in the case of fixing a branch pipe 4 comprising a saddle part 2 and a sloped branch outer pipe 3 to a peripheral outer surface of the through-hole 11, a branch inner pipe 6 having an outward facing flange 5 provided in the lower end is used, and after the outward facing flange 5 is made to pass through the through-hole 11, the saddle part 2 and the branch outer pipe 3 are inserted to the branch inner pipe 6, and when the flexible pipe 7 is firmly interposed by the saddle part 2 and the outward facing flange 5, the branch pipe 4 can be fixed, a free access method can be applied.