[Problem] To provide a reinforcing fiber bundle that can maintain a good opening state of reinforcing fibers and that can produce a fiber-reinforced composite having excellent mechanical strength; a reinforcing fiber woven fabric using the same; a carbon fiber reinforcing composite using the same; and methods for producing the same.
[Solution] A reinforcing fiber bundle comprising a plurality of reinforcing fibers is produced, the reinforcing fiber bundle having a cross-linking portion comprising a carbon allotrope between the reinforcing fibers.