PURPOSE: To obtain a metal plated fire retardant FRP sheet containing no solvent and having high productivity, by a method wherein a fibrous material for reinforcement is impregnated with a fire retardant resin liquid containing an electron beam curing chemical compound and one side of the fibrous material is plated with metal foil, to which an electron beam is irradiated.

CONSTITUTION: A fibrous base material for reinforcement is made to impregnate with resin including a fire retardant electron beam curing chemical compound including an element having self-flame-extinction property and an ethylene unsaturated chemical compound in the same molecule or liquid resin consisting of a fireproof agent including the element having the self-flame-extinction property and an electron beam curing chemical compound including the ethylene unsaturated bonding. Then after plating metal foil on one side of the fibrous base material, an electron beam is irradiated from a side opposite to the side where the metal foil is plated. As for the electron beam curing chemical compound including the ethylene unsaturated bonding for use, prepolymer, oligomer and monomer having the ethylene unsaturated bonding in their molecules can be cited.