To provide a composition for a coating agent capable of forming a coating film excellent in the weather resistance, having high uniformity and having favorable gloss on the surface.A composition for a coating agent, which comprises a fluoropolymer (component A) containing units (A2) having a compound represented by the following formula (1) reacted with units based on a hydroxy group-containing monomer and units (A1) based on a fluoroolefin, and component B represented by the following formula (2), wherein the proportion of the component A is from 10 to 90 mass % to the total content of the component A and the component B: OCN(CH2)mSiXnR3-n  (1) wherein R is a hydrogen atom or a monovalent hydrocarbon group, X is an alkoxy group, n is an integer of from 1 to 3, and m is an integer of from 1 to 5, (R1)4-aSi(OR2)a  (2) wherein each of R1 and R2 which are independent of each other, is a monovalent hydrocarbon group, and “a” is an integer of from 1 to 4.