The purpose of the present invention is to prevent the occurrence of voids and to improve fixation force between reinforcing fibers and a matrix resin that is composed of a thermoplastic resin, thereby enhancing mechanical characteristics such as strength and elastic modulus with respect to a fiber reinforced composite material which is molded with use of reinforcing fibers, especially a sheet-like fiber base material such as a woven fabric or nonwoven fabric of reinforcing fibers, while using a thermoplastic resin as the matrix resin. A resin filled fiber base material, which is obtained by filling the spaces among fibers of a fiber base material with a thermoplastic polyurethane for filling and a crosslinking agent, and which is configured such that the amount of the thermoplastic polyurethane for filling applied to the fiber base material is from 5 parts by mass to 35 parts by mass (inclusive) relative to 100 parts by mass of the fiber base material.
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