Abstract: An object of the present invention is to provide an epoxy resin composition having excellent viscosity stability and having a high compression property and high fracture toughness at the time of wet heating, and to provide a fiber-reinforced composite material obtained by using, as a matrix resin, a cured resin obtained by curing the epoxy resin composition. An epoxy resin composition including a component [A] and a component [B] and satisfying Condition 1 and Condition 2 described below: [A]: a tetrafunctional glycidyl amine type epoxy resin, [B]: dimethylthiotoluenediamine, Condition 1: in the epoxy resin composition, a content of the component [A] is 20 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of a total epoxy resin, Condition 2: in the epoxy resin composition, a value (E82/E23) obtained by dividing a flexural modulus (82° C. under wet condition) by a flexural modulus (at 23° C. and 50% RH) is 0.75 or more.

Abstract: A purpose of the present invention is to provide a thermosetting epoxy resin composition that manifests latency at a temperature at which the thermosetting resin cures and has an excellent curing rate, and molded articles obtained by thermosetting the same. A further purpose is to provide a fiber-reinforced composite material obtained by blending with reinforcing fibers, a molding material for a fiber-reinforced composite material, and a method for producing a fiber-reinforced composite material. To achieve the above, the thermosetting epoxy resin composition of the present invention is a thermosetting epoxy resin composition including the following constituent elements [a], [b], and [c], wherein the relationship between the curing time (Tc) and the induction time (Ti) satisfies 1<Tc/Ti?9.