PROBLEM TO BE SOLVED: To provide a contrast thread which is prevented from being detached a gauze as much as possible from the viewpoint of the structure of the contrast thread.SOLUTION: A contrast thread 1 is provided with a core wire 7 and a side wire 5 wound around the outer periphery of the core wire 7, and at least one of the core wire 7 and the side wire 5 is made of radiopaque strands. The side wire 5 is constituted of a stranded wire obtained by stranding a plurality of strands 5a, 5b, 5c, 5d, 5e, 9a and 9b, the stranding direction of the stranded wire being the same as the winding direction of the side line 5 with respect to the core wire 7.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2020,JPO&INPIT【課題】 造影糸の構造の観点から、ガーゼからの離脱を極力防止した造影糸を提供する。【解決手段】 芯線７と、その芯線７の外周に巻回された側線５とを備え、芯線７および側線５のうち少なくとも一方が放射線不透過性の素線からなる造影糸１において、側線５は複数の素線５ａ，５ｂ，５ｃ，５ｄ，５ｅ，９ａ及び９ｂを撚った撚線から構成され、撚線の撚り方向を、側線５の芯線７に対する巻き方向と同一方向とした。【選択図】 図２
