An aromatic ring-containing polymer is provided having excellent flexibility and surface water-repellency. The polymer containing an aromatic ring has a fluoroalkyl group having two or more carbon atoms as a side chain, which is optionally interrupted by divalent group, wherein the fluoroalkyl group satisfies the following formula (a): A/(A+B).gtoreq.0.4 (a) wherein in the formula, A represents the number of fluorine atoms in the fluoroalkyl group and B represents the number of hydrogen atoms in the fluoroalkyl group.