Epoxy resin composition, cured product, and composite material

This epoxy resin composition contains an epoxy resin and a curing agent, wherein: the epoxy resin contains an epoxy compound having, in one molecule, two or more structural units represented by general formula (I) and two or more epoxy groups; and the curing agent contains a compound having two or more amino groups directly bonded to an aromatic ring. In general formula (I), R 1 -R 4 each independently represent a hydrogen atom or an alkyl group having 1-3 carbon atoms.