PURPOSE: To manufacture a reinforcing component of excellent tensile strength and bending strength and excellent carrying properties and grip properties for concrete or the like by forming a lace knitted with a plurality of string bodies, at least one of which is a long fiber reinforced plastic, forming spaces among one another.

CONSTITUTION: Organic long fiber like Aramid fiber or the like, or inorganic long fiber like glass fiber, carbon fiber or the like is impregnated with thermosetting resin and thermally cured, and as the case may be, its surface is coated with a thermoplastic resin. At that time, said string bodies 3 knitted into a lace, while spaces 4 are formed. At that time, the area of space 4 per unit L in a projected image is preferably 0.1-10 times as big as the area of lace per unit L. At least said material is used for one of the string bodies 3 to be used, while for example, a wire coated with synthetic resin or the like can be used for the rest of them. Said reinforcing component can be taken up on a reel or the like and can be used in place of a reinforcing bar or the like as a concrete reinforcing material.