Patent ID: 8263714

Claim:
An epoxy resin composition comprising an epoxy resin and a curing agent as essential components, wherein the epoxy resin has each structure of a glycidyloxy group-containing aromatic hydrocarbon group (E), an alkoxy group-containing aromatic hydrocarbon group (B) and a divalent aralkyl group (X), and also has, in a molecular structure, a structure in which the glycidyloxy group-containing aromatic hydrocarbon group (E) and the alkoxy group-containing aromatic hydrocarbon group (B) are bonded to another glycidyloxy group-containing aromatic hydrocarbon group (E) or alkoxy group-containing aromatic hydrocarbon group (B) via the divalent aralkyl group (X), wherein the alkoxy group-containing aromatic hydrocarbon group (B) is a divalent or trivalent aromatic hydrocarbon group formed from a molecular structure selected from methoxybenzene, methoxynaphthalene, ethoxybenzene, ethoxynaphthalene, and a compound having a methyl group as a substituent on the aromatic nucleus of them, wherein the divalent aralkyl group (X) is a divalent hydrocarbon group having a structure represented by the following structural formula (1): wherein R 1 represents a hydrogen atom or a methyl group, and Ar represents a phenylene group, a biphenylene group or a diphenyl ether-4,4′-diyl group, and wherein the glycidyloxy group-containing aromatic hydrocarbon group (E) is a divalent or trivalent aromatic hydrocarbon group formed from a molecular structure selected from glycidyloxybenzene, glycidyloxynaphthalene, and a compound having a methyl group as a substituent on the aromatic nucleus of them.