To provide a building ready for maintenance, a pulley for supporting piping, wiring, etc., a piping/wiring executing method, and a piping/wiring replacing method allowing easy execution of works, capable of suppressing the construction costs, and shortening the construction time.

The supporting pulley 11 for flexible piping, wiring, etc. to guide the taking-out of the piping, wiring, etc. 1 is installed in the structural inner space of a building, and the piping, wiring, etc. is replaced in the building 10 ready for maintenance where the piping, wiring, etc. is set on and supported by the supporting pulley 11. One end of the flexible piping, wiring, etc. 1 for replacing is attached to one end of the piping, wiring, etc. 1 set on the supporting pulley 11, and then the piping, wiring, etc. 1 set on the supporting pulley 11 is drawn out from the other end while the piping, wiring, etc. 1 for replacing is set on the supporting pulley 11 and supported.