EPOXY RESIN COMPOSITION, PREPREG, ABD FIBER-REINFORCED COMPOSITE MATERIAL

It is an object of the present invention to provide a fiber reinforced composite material combining good properties such as toughness and impact resistance and to provide an epoxy resin composition to obtain this. This object is achieved by the an epoxy resin composition comprising the following [A], [B], [C], and [D]: [A] a diglycidyl ether-type epoxy resin having a molecular weight of 1,500 or more; [B] an epoxy resin in which an SP value of a structural unit thereof is greater by 1.5 to 6.5 than an SP value of a structural unit of [A]; [C] a diglycidyl ether-type epoxy resin having a molecular weight of 500 to 1,200; and [D] an epoxy resin curing agent, in a ratio that satisfies the following formulas (1) to (4): 0.2 ‰¤ A / A + B + C + E ‰¤ 0.6 ; 0.2 ‰¤ B / A + B + C + E ‰¤ 0.6 ; 0.15 ‰¤ C / A + B + C + E ‰¤ 0.4 ; 0 ‰¤ E / A + B + C + E ‰¤ 0.2 , wherein A, B, and C represent weights of [A], [B], and [C], respectively, and E represents a weight of an epoxy resin other than [A], [B], and [C].