Epoxy resin compositions and fiber-reinforced composite material

Providing tensile strength and epoxy resin composition suitably used heat-resistant fiber reinforced composite material having both a high level and a fiber-reinforced composite material produced by using the epoxy resin composition. Rubbery modulus at dynamic viscoelasticity evaluation of cured product obtained by curing the epoxy resin composition is not more than 10 MPa, and the glass transition temperature of the cured product is 95 ° C. or higher, the components [A] and [B comprises] a further component [C] or epoxy resin composition comprising [D]. [A] a cycloalkyl diamine in which the carbon atom adjacent to the carbon atom bonded to the aromatic diamine or the amino group having 3 or more functional aromatic epoxy resin [B] substituent at the ortho position of the amino group has a substituent [C] aliphatic polyamines [D] a linear or branched aliphatic polyamines having 6 to 12 carbon atoms and having an alkylene glycol structure