PROBLEM TO BE SOLVED: To ensure that a fishing line is hardly detached from a line locking tool in an inexpensive and simple structure.SOLUTION: A line locking tool 70 is fitted to a spool 4 of a spinning reel. The line locking tool 70 comprises: a fitting part 72 that can be fitted to the spool 4 and a locking tool body 74 that is provided on the fitting part 72 and locks a fishing line FL between itself and a surface of the spool 4. The locking tool body 74 comprises a fitting end part 76, an introduction end part 78, and a movement restriction part 80. The fitting end part 76 is an end part that is provided with the fitting part 72 and has a first width W1 in a circumferential direction of the spool 4. The introduction end part 76 is an end part to which the fishing line FL is introduced. The movement restriction part 80 is arranged between the fitting end part 76 and the introduction end part 78 and has a second width W2 (a third width W3) that is different from the first width W1.COPYRIGHT: (C)2015,JPO&INPIT【課題】安価かつ容易な構成によって、釣り糸を糸係止具から外れにくくする。【解決手段】糸係止具70は、スピニングリールのスプール4に装着される。糸係止具70は、スプール4に装着可能な装着部72と、装着部72に設けられ、スプール4の表面との間で釣り糸FLを係止するため係止具本体74と、を備える。係止具本体74は、装着端部76と導入端部78と移動規制部80と、を有する。装着端部76は、装着部72が設けられ、スプール4の周方向に第1幅W1を有する端部である。導入端部76は、釣り糸FLが導入される端部である。移動規制部80は、装着端部76と導入端部78との間に配置され、第1幅W1と異なる第2幅W2(第3幅W3)を有する。【選択図】図3