DISCLOSED IS AN EPOXY RESIN COMPOSITION ESSENTIALLY CONTAINING (A) AN EPOXY RESIN HAVING A STRUCTURE REPRESENTED BY THE GENERAL FORMULA (1) BELOW, (B) A CURING AGENT, (C) AN INORGANIC FILLER, AND (D) A CYANATE RESIN AND/OR A PREPOLYMER THEREOF. (IN THE FORMULA, AR REPRESENTS A FUSED-RING AROMATIC HYDROCARBON GROUP; R REPRESENTS AN INTEGER NOT LESS THAN 1; X REPRESENTS A HYDROGEN OR AN EPOXY GROUP (A GLYCIDYL ETHER GROUP); R1 REPRESENTS ONE GROUP 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 REPRESENTS AN INTEGER NOT LESS THAN 1; AND P AND Q EACH REPRESENTS AN INTEGER NOT LESS THAN 1, AND P ’ S AND Q ‘ S IN RESPECTIVE REPEATING UNITS MAY BE THE SAME AS OR DIFFERENT FROM ONE ANOTHER.) (FIG.3)
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