Epoxy resin composition for fiber-reinforced composite material, prepreg, and fiber-reinforced composite material

An epoxy resin composition for a fiber-reinforced composite material, comprising:

• (a) one or more epoxy resins;
• (b) an aromatic diamine compound;
• (c) a dicyandiamide;
• (d) a urea compound;
• and
• (e) an amine adduct compound,
• blended in the following blending proportions:
• a blending proportion of the (b) aromatic diamine compound being from 0.2 to 0.6 equivalents relative to the (a) epoxy resin,
• a blending proportion of the (c) dicyandiamide being from 0.5 to 4.0 mass % relative to a total of the (a) to (e) components,
• a blending proportion of the (d) urea compound being from 0.5 to 2.0 mass % relative to the total of the (a) to (e) components, and
• a blending proportion of the (e) amine adduct compound being from greater than 0 mass % to 3.0 mass % relative to the total of the (a) to (e) components, wherein
• a glass transition temperature of a cured product is 110° C. or higher, the cured product being obtained by curing the resin composition under curing conditions:
• at 120° C. and for 1.5 hours, until a state where demolding from a mold can be performed.