An epoxy resin composition comprising the following constituent elements and, wherein the epoxy resin composition cured into a cured product has a rubbery state elastic modulus in a dynamic viscoelasticity evaluation of 10 MPa or less, and the cured product has a glass transition temperature of 95°C or higher, the rubbery state elastic modulus in a dynamic viscoelasticity evaluation and the glass transition temperature being measured by methods set out in the description: a bifunctional or higher functional epoxy resin containing an aromatic ring; and an acid anhydride hardener, wherein (i) constituent element comprises the following constituent element, and constituent element comprises the following constituent elements and: a bifunctional or higher functional epoxy resin having a fluorene structure; an acid anhydride represented by the following general formula: wherein R 4 represents any one of linear or branched alkyl, alkenyl, and alkynyl groups having 6 to 16 carbon atoms; and at least one acid anhydride selected from the group consisting of tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methyl nadic anhydride, hexahydrophthalic anhydride, and methylhexahydrophthalic anhydride, and optionally having a ratio of parts by mass of the constituent element to the sum of parts by mass of the constituent elements and of 0.3 to 0.6, or (ii) constituent element comprises at least one of the following constituent elements and, and the epoxy resin composition further comprises the following constituent element: an optionally substituted diglycidyl aniline; tetraglycidyl diaminodiphenylmethane; and a monofunctional epoxy resin which is a phenyl glycidyl ether substituted with a tert-butyl group, a sec-butyl group, an isopropyl group, or a phenyl group, and optionally comprising 20 to 50 parts by mass of the constituent element in 100 parts by mass of the total epoxy resin, and optionally comprising the constituent elements and as the constituent element. a bifunctional or higher functional epoxy resin containing an aromatic ring; and an acid anhydride hardener, wherein (i) constituent element comprises the following constituent element, and constituent element comprises the following constituent elements and: a bifunctional or higher functional epoxy resin having a fluorene structure; an acid anhydride represented by the following general formula: wherein R 4 represents any one of linear or branched alkyl, alkenyl, and alkynyl groups having 6 to 16 carbon atoms; and at least one acid anhydride selected from the group consisting of tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methyl nadic anhydride, hexahydrophthalic anhydride, and methylhexahydrophthalic anhydride, and optionally having a ratio of parts by mass of the constituent element to the sum of parts by mass of the constituent elements and of 0.3 to 0.6, or (ii) constituent element comprises at least one of the following constituent elements and, and the epoxy resin composition further comprises the following constituent element: an optionally substituted diglycidyl aniline; tetraglycidyl diaminodiphenylmethane; and (i) constituent element comprises the following constituent element, and constituent element comprises the following constituent elements and: a bifunctional or higher functional epoxy resin having a fluorene structure; an acid anhydride represented by the following general formula: wherein R 4 represents any one of linear or branched alkyl, alkenyl, and alkynyl groups having 6 to 16 carbon atoms; and at least one acid anhydride selected from the group consisting of tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methyl nadic anhydride, hexahydrophthalic anhydride, and methylhexahydrophthalic anhydride, and optionally having a ratio of parts by mass of the constituent element to the sum of parts by mass of the constituent elements and of 0.3 to 0.6, or a bifunctional or higher functional epoxy resin having a fluorene structure; an acid anhydride represented by the following general formula: wherein R 4 represents any one of linear or branched alkyl, alkenyl, and alkynyl groups having 6 to 16 carbon atoms; and at least one acid anhydride selected from the group consisting of tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methyl nadic anhydride, hexahydrophthalic anhydride, and methylhexahydrophthalic anhydride, and optionally having a ratio of parts by mass of the constituent element to the sum of parts by mass of the constituent elements and of 0.3 to 0.6, or (ii) constituent element comprises at least one of the following constituent elements and, and the epoxy resin composition further comprises the following constituent element: an optionally substituted diglycidyl aniline; tetraglycidyl diaminodiphenylmethane; and an optionally substituted diglycidyl aniline; tetraglycidyl diaminodiphenylmethane; and a monofunctional epoxy resin which is a phenyl glycidyl ether substituted with a tert-butyl group, a sec-butyl group, an isopropyl group, or a phenyl group, and optionally comprising 20 to 50 parts by mass of the constituent element in 100 parts by mass of the total epoxy resin, and optionally comprising the constituent elements and as the constituent element.