Epoxy resin composition, prepreg, and fiber reinforced composite material

A fiber reinforced composite material comprising carbon fiber and a cured product of an epoxy resin composition comprising the following components [A] to [C]:

• [A] epoxy resin;
• [B] polyamine curing agent;
• and
• [C] a compound having
• a boiling point of 130° C. or more,
• a molecular weight of 50 or more and 150 or less,
• no epoxy groups in the component [C] molecule, and
• substantially no ability to cure an epoxy resin,
• wherein the following conditions (1) to (4) are satisfied:
• (1) at least a portion of the component [C] is a compound having two or more alcoholic hydroxyl groups in the molecule;
• (2) a ratio C/E of an amount by mole, E, of epoxy groups of the component [A] to an amount by mole, C, of the component [C] satisfying the condition (1) is 0.01 or more and 0.20 or less;
• (3) the epoxy resin composition has a viscosity at 70° C. for 2 hours that is 5.0 times or less than an initial viscosity at 70° C.;
• and
• (4) the component [C] remains present in the cured product.