Abstract: There is provided an insert nut, wherein a dies is pressed on one surface of a predetermined metal plate 7 to form a screw portion 8, so as to form a patterned portion 9 on the other surface of the metal plate by forming the screw portion, wherein the metal plate 7 is wound such that the screw portion 8 to become a female screw 2 is located inside so as to form a cylindrical form, and then the opposite edges 7a, 7b of the wound metal plate are connected together to form a cylindrical shank portion 3, wherein the outside surface of the exposed patterned portion of the shank 3 is covered with a resin layer 6 such that projections 5 of a synthesis resin is formed at the outside thereof.