The object of the present invention is excellent in color fastness, even less processing amount of the organic phosphorus compound to the fibrous materials it is possible to impart a good flame retardancy, it can reduce the can body pollution and wastewater loading fibers use flame-retarding agent, the method of producing the flame-retardant fiber using the flame retarding agent, it is to provide a flame-retardant fiber obtained by the production side. The present invention, tricresyl phosphate composed mainly of tri -p- cresyl phosphate (A), contains a surfactant and water, the tricresyl phosphate (A) whole occupies tri -p--cresyl weight ratio of the phosphate is 90% by weight or more, and a fiber for flame-retarding agents.
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