Fabric treating agent composition

A fiber product treating agent composition comprising (a) a nonionic surfactant containing 1 to 3 polyoxyalkylene groups having the number-average addition mol number of the oxyalkylene group of 50 to 200 and 1 to 3 hydrocarbon groups having 14 to 32 carbon atoms and having an HLB of 16 or more and a melting point of 30 to 80° C., (b) an amino-modified silicone compound, (c) at least one type selected from a tertiary amine in which one or two groups of the three groups bonded to a nitrogen atom of the tertiary amine is/are a hydrocarbon group having 10 to 20 carbon atoms and the remainder group(s) is/are a hydrocarbon group which has 1 to 3 carbon atoms and may be substituted with a hydroxy group, an acid salt thereof and a quaternary product thereof, and (d) polymer compound having the weight-average molecular weight of 2000 or more (excluding component (a) and component (b)), at a mass ratio of the component (a)/the component (b) of 4/1 to 1/4, at a mass ratio of the component (a)/the component (c) of 20/1 to 1/1, at a mass ratio of [the component (a)+component (b)]/[component (c)+component (d)] of 95/5 to 80/20.