CYANATE ESTER COMPOUND, CURABLE RESIN COMPOSITION CONTAINING THE SAME, AND HARDENED PRODUCT THEREOF

There is provided a novel cyanate ester compound which has excellent solvent solubility and provides a hardened product having a low coefficiency of thermal expansion, and excellent flame retardancy and heat resistance. The present invention is a cyanate ester compound represented by the following formula (1): wherein Ar represents an aromatic ring; R 1 each independently represents a hydrogen atom, an alkyl group, or an aryl group; n each independently represents an integer of 1 to 3; m + n is the same as the total number of hydrogen atoms in a monovalent aromatic group containing the aromatic ring and the hydrogen atoms; R 2 represents a hydrogen atom (excluding a case where Ar represents a benzene ring; n each represents 1; R 1 represents a hydrogen atom; m each represents 4, and a cyanate group is bonded to the benzene ring in the 4-position relative to an adamantyl group), or an alkyl group having 1 to 4 carbon atoms; and R 3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.