A coating agent composition comprising a perfluoropolyether compound of the following general formula: [M c R b Si-Z 2] a -Q 1 -Z 1 -Rf-Z 1 -Q 1 -[Z 2 -SiR b M c] a wherein Rf is a divalent perfluoropolyether group having a numerical average molecular weight of 1,500 to 20,000; each Z 1 is independently a divalent linking group, optionally contains an oxygen atom, a nitrogen atom, a fluorine atom or a silicon atom, and may be a group having a cyclic structure and/or an unsaturated bond; each Z 2 is independently a divalent hydrocarbon group having 2 to 20 carbon atoms, may have a cyclic structure, and optionally contains an intermediate ether bond (-O-); each Q 1 is independently a linking group with a valence of (a+1), and may have cyclic structure, the linking group having a siloxane structure with at least (a+1) silicon atoms, an unsubstituted or halogen-substituted silalkylene structure, a silarylene structure, or a combination of two or more thereof; each a is independently an integer of 1 to 10, each b is independently an integer of 0 to 2, each c is independently an integer of 1 to 3, and b and c on one silicon atom satisfy b + c = 3; all "a" number of Z 2 in the square bracket in formula are bonded to the silicon atom in the Q 1 structure; each R is independently a monovalent hydrocarbon group having 1 to 6 carbon atoms; and each M is independently a group selected from the group consisting of an alkoxy group having 1 to 10 carbon atoms, an alkoxyalkyl group having 2 to 10 carbon atoms, an alkoxyalkoxy group having 2 to 10 carbon atoms, an acyloxy group having 1 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, and a halogen group; and a perfluoropolyether compound of the following general formula: F-Rf'-F wherein Rf' is a divalent perfluoropolyether group having a numerical average molecular weight of 1,500 to 20,000; wherein the numerical average molecular weight of the divalent perfluoropolyether groups Rf and Rf' is determined by calculation from a ratio between an end structure and a repeating unit structure as obtained from a 19 F-NMR spectrum; and wherein the content ratio of the perfluoropolyether compound is less than 2.5 mol% per a total of 100 mol% of the component and the component, and the content of a fluorine-containing solvent having a boiling point of 260°C or lower at normal pressure is less than 1 wt% with respect to the entire composition. wherein Rf is a divalent perfluoropolyether group having a numerical average molecular weight of 1,500 to 20,000; each Z 1 is independently a divalent linking group, optionally contains an oxygen atom, a nitrogen atom, a fluorine atom or a silicon atom, and may be a group having a cyclic structure and/or an unsaturated bond; each Z 2 is independently a divalent hydrocarbon group having 2 to 20 carbon atoms, may have a cyclic structure, and optionally contains an intermediate ether bond (-O-); each Q 1 is independently a linking group with a valence of (a+1), and may have cyclic structure, the linking group having a siloxane structure with at least (a+1) silicon atoms, an unsubstituted or halogen-substituted silalkylene structure, a silarylene structure, or a combination of two or more thereof; each a is independently an integer of 1 to 10, each b is independently an integer of 0 to 2, each c is independently an integer of 1 to 3, and b and c on one silicon atom satisfy b + c = 3; all "a" number of Z 2 in the square bracket in formula are bonded to the silicon atom in the Q 1 structure; each R is independently a monovalent hydrocarbon group having 1 to 6 carbon atoms; and each M is independently a group selected from the group consisting of an alkoxy group having 1 to 10 carbon atoms, an alkoxyalkyl group having 2 to 10 carbon atoms, an alkoxyalkoxy group having 2 to 10 carbon atoms, an acyloxy group having 1 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, and a halogen group; and a perfluoropolyether compound of the following general formula: F-Rf'-F wherein Rf' is a divalent perfluoropolyether group having a numerical average molecular weight of 1,500 to 20,000; wherein the numerical average molecular weight of the divalent perfluoropolyether groups Rf and Rf' is determined by calculation from a ratio between an end structure and a repeating unit structure as obtained from a 19 F-NMR spectrum; and wherein the content ratio of the perfluoropolyether compound is less than 2.5 mol% per a total of 100 mol% of the component and the component, and the content of a fluorine-containing solvent having a boiling point of 260°C or lower at normal pressure is less than 1 wt% with respect to the entire composition.