Abstract: An acaricide fiber material including a number of individual fibers and an acaricide component fixed to the individual fibers and consisting essentially of a solution comprising at least one member selected from the group consisting of N-(fluorodichloromethylthio)-phthalimide, N-methyl-N,-phenyl-(N'-fluorodichloro-methylthio)-sulfamide, 4-chlorophenyl-3'-iodoproparagyl formal, and 2,4,4'-trichloro-2'-hydroxydiphenyl-ether, dissolved in a carrier consisting of at least one type of phthalic acid ester, prepared by suspending the acaricide solution in an aqueous medium, applying the acaricide aqueous suspension to a fiber material comprising the individual fibers, and drying the aqueous suspension layers on the individual fibers to fix the acaricide component to the individual fibers.