The present invention is to provide a phosphorus containing epoxy resin compositions, comprising an epoxy resin composition (a) in which a phosphorus containing epoxy resin (A) and a hardener are contained, wherein said phosphorus containing epoxy resin (A) is a phosphorus containing resin composition prepared by reacting phosphorus containing organic compounds (B) obtained by the reaction in the range of molar ratio of 1.01 to 2 moles of organic phosphorus compounds (b) having one active hydrogen atom bonded to phosphorus atom and 1 mole of quinone compound with at least one kind of epoxy resins (C) selected from the groups composed of general formula 1, general formula 2 or general formula 3 so as the content of said epoxy resins (C) to be from 20 to 45 wt. %, wherein R1 is a hydrogen atom and/or a phenyl group, m is an integer including 0, wherein R2 is a hydrogen atom and/or a phenyl group, n is an integer including 0, wherein R3 is a hydrogen atom and/or a phenyl group, I is an integer including 0, in addition X is —CH2—, —O—, —CO—, —SO2—, —S—, —CH(C6H5)—, —C(C6H5)2—, not existing functional group or chemical formula 4.