Water-repellent agent composition for fibers, water-repellent textile product, and production method for water-repellent textile product

This water-repellent agent composition contains: an acrylic resin having a constituent unit derived from a (meth)acrylic acid ester monomer (A) represented by general formula (A-1) and/or a urethane resin having a structural unit derived from a polyfunctional compound represented by general formula (I-1) and a structural unit derived from an isocyanate compound represented by general formula (II-1); an organo-modified silicone represented by general formula (L-1); and a wax. [In formula (A-1), R1 represents hydrogen or a methyl group, R2 represents an optionally substituted monovalent hydrocarbon group having 12 or more carbon atoms.] (I-1): R31[-W1-R32]d[-V1]e [In formula (I-1), d represents an integer of one or more, e represents an integer of two or more, (d+e) is 3-6, R31 represents a (d+e)-valent organic group, W1 represents a divalent group which is an ester group, an amide group, a urethane group, or a urea group, R32 represents a straight-chain or branched monovalent hydrocarbon group having 8-24 carb