PURPOSE: To obtain a fiber-reinforced composite material, such as I-, H- or T-shaped cross section, excellent in strength by combining a structure, which is three-dimensional cloth, respectively composed of warp yarn, weft yarn and joining yarn and having recessed parts with a structure which is three-dimensional cloth, respectively composed of warp yarn, weft yarn and joining yarn and having protruding parts, sewing and bonding both structures, impregnating the bonded structures with a resin and curing the resin.

CONSTITUTION: A fiber-reinforced composite material, such as I-, H- or T-shaped cross section, suitable as spar materials of aircraft, etc., building materials, etc., obtained by combining a structure 10, which is three-dimensional cloth, respectively composed of warp yarn, weft yarn and joining yarn and having cloth layers, composed of the warp yarn, weft yarn and joining yarn and bound in the thickness direction with the joining yarn in the central part or one side part in the width direction and flange parts (10d) of bisected cloth layers respectively bound in the thickness direction in the both side parts or one side part with a structure 20, which is three-dimensional cloth, respectively composed of warp yarn, weft yarn and joining yarn and having streaky protruding parts (20a) filling recessed parts of the above-mentioned flange parts (10d) in the central part of one side, sewing and/or bonding the structures, impregnating the resultant structures with a resin and curing the resin.