Patent ID: 8465837

Claim:
An epoxy resin composition comprising, as essential components, an epoxy resin (A) having a structure represented by general formula (1), a curing agent (B), an inorganic filler (C), and a cyanate resin and/or a prepolymer of the cyanate resin (D), wherein Ar represents a substituted fused aromatic hydrocarbon group; r is an integer of 1 or more; X represents a hydrogen or an epoxy group (glycidyl ether group); R 1 represents one selected from the group consisting of a hydrogen, a methyl group, an ethyl group, a propyl group, a butyl group, a phenyl group and a benzyl group; n is an integer of 1 or more; each of p and q is an integer of 1 or more; p's and q's in respective repeating units may be the same as or different from one another, and wherein the substituted fused aromatic hydrocarbon group [Ar] in said epoxy resin (A) having the structure represented by general formula (1) is one selected from the group consisting of the structures represented by formulas (Ar1) to (Ar4), wherein R 2 represents one selected from the group consisting of a hydrogen atom, a methyl group, an ethyl group, a propyl group, a butyl group, a phenyl group and a benzyl group.