To obtain pipes for wire-laying which can be used while combining appropriately according to the number of wires or the size thereof by providing a round pipe body of synthetic resin being inserted into a rectangular pipe body of synthetic resin and providing synthetic resin ribs for supporting the round pipe body radially at a plurality of points between the pipe bodies.

A pipe A comprises a rectangular pipe body 1 of synthetic resin, a round pipe body 2 of synthetic resin being inserted into the rectangular pipe body 1 and synthetic resin ribs. The ribs 3,... extend integrally and centripetally from the inner face of rectangular pipe body 1 and provided, at the end thereof, with a seat 31. The rectangular pipe body 1 having ribs 3,... is formed of synthetic resin by extrusion molding. The round pipe body 2 is inserted into a space surrounded by the seats 31,... of ribs 3,... and supported by the seats 31,... in the center of rectangular pipe body 1. Consequently, the round pipe body 2 is supported by the rectangular pipe body 1 through radial ribs 3,....