Abstract: An epoxy resin composition is provided that has an elastic modulus, deformability, fracture toughness, and heat resistance in good balance. A prepreg produced from the epoxy resin composition and a fiber-reinforced composite material produced by curing the prepreg are also provided, where the epoxy resin composition includes the components [A], [B], and [C] and satisfies all of the requirements (1), (2), and (3) as described.

Abstract: The purpose of the present invention is to provide an epoxy resin composition which exhibits a high level of deforming capacity and fracture toughness and from which a resin cured product maintaining heat resistance can be obtained. The epoxy resin composition according to the present invention satisfies condition 1 or condition 2 below, wherein the resin cured product obtained by reacting the epoxy resin composition at 150° C. for 60 minutes has a tensile elongation at break of 7% or more. Condition 1: including all the following components [A], [B], and [C], component [A]: a bifunctional aliphatic epoxy resin having a specific structure, component [B]: a terminal carboxy-modified acrylic rubber, and component [C]: a dicyandiamide.