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(57) Abstract: A microemulsion of an organopolysiloxane having an epoxy group-containing organic group and a carboxyl group-containing organic group in one molecule, and a fiber treatment agent containing the microemulsion as a main component. SOLUTION: (A) An epoxy group-containing organic group bonded to at least one silicon atom in one molecule, and a formula bonded to 0.5 mol% to 15 mol% of a silicon atom: —R 3 —C OOR 4 [In the formula, R 3 is a divalent hydrocarbon group, R 4 is a hydrogen atom, a monovalent hydrocarbon group and a formula: —SiR 5 3 (wherein, R 5 is the same or different monovalent hydrocarbon group. ) Is a group selected from the group consisting of silyl groups. ] Organopolysiloxane having a carboxyl group-containing organic group represented by the following, (B) nonionic surfactant, (C) A microemulsion consisting of water and having an average particle size of 0.15 μm or less, and a fiber treatment agent containing the microemulsion as a main component. |