To form a length-measuring band suitable for storing a weft without requiring many man-hours.

This method for producing a length-measuring band 7 includes fixing a lower mold at a prescribed position of a press machine, loading a uniformly thin raw plate composed of an iron-based material needed for the formation of the length-measuring band 7 on the lower mold, pressing down an upper mold with a prescribed pressure to pressing the raw plate, and then forming a V-shaped bent portion 14 at the final step for bending by the pressing.