Curable epoxy resin composition, fiber-reinforced composite material and molded body using same

A resin composition for a fiber-reinforced composite material, comprising an epoxy resin (A), an acid anhydride-based curing agent (B), an imidazole-based curing accelerator (C), a radically polymerizable monomer (D), and a radical polymerization initiator (E) as essential components, having a viscosity at 25° C. that falls within a range of 50 mPa·s to 800 mPa·s as measured by an E-type viscometer, and exhibiting a viscosity increase ratio of 200% or less after 8 h at 25° C., wherein 50% by mass or more of the acid anhydride-based curing agent (B) is an alicyclic acid anhydride having no olefinic unsaturated bond;

• wherein the radically polymerizable monomer (D) is represented by a following general formula (1) and has a viscosity at 25° C. of 800 mPa·s or less as measured by an E-type viscometer,
• wherein, R1 independently represents a hydrogen atom or a methyl group, X represents a functional group selected from the group consisting of a hydroxyl group, a methoxy group, an ethoxy group, a nitrile group, a cyano group, and a halogen group;
• a represents 2 or 3;
• b represents 0 or 1;
• and R2 represents a C6-C40 hydrocarbon group having a valence of a+b, which have an ether-linked or ester-linked oxygen atom therein.