To provide a papermaking wire stain-preventing agent for preventing the adhesion of the stain to the papermaking wire in the wire part of a papermaking machine; and a method for preventing the papermaking wire from staining by using the same.

This papermaking wire 1 stain-preventing agent contains a polyether ester polycondensation material obtained by poly-condensing a monomer components containing (A) a polyoxyalkylene glycol, (B) a dihydroxy compound and (C) an aromatic dicarboxylic acid or its derivative. The method for preventing the papermaking wire from staining includes the application of the papermaking wire stain-preventing agent on the surface of the papermaking wire. The method for applying the agent enables the adhesion of the agent by blowing it to the papermaking wirefrom each of nozzles of each of showers 10, 11, 12.