PROBLEM TO BE SOLVED: To provide a fishing line connection device in which preparation before wire connection is possible safely and easily without using and discarding an expensive PE line uselessly more than necessary in a simple procedure, wire connection work can reliably be performed without rotary runout and rolling up an extra line, the finishing work can quickly be completed easily and completely without line sliding and disconnection, the remainder line after the wire connection can easily be removed, and it is small and easily carried.SOLUTION: A fishing line connection device 100 has a shaft 1, a ring 2 and a circlip 3 for the coming-off prevention of the ring 2. A hole a is axially penetrated into the shaft 1, and the contour of the shaft 1 and the inner diameter of the ring 2 are tapered. A main line m is penetrated into the hole a, and is put into a gap between the outer circumference of the shaft 1 and the hole of the ring 2. The main line m is crimped to the shaft 1 and the ring 2 by sliding the ring 2. The line connection device 100 is rotated while the shaft 1 and the ring 2 are self-retained. The main line m is braided and tightened into an outer circumference of a leader line by centrifugal force.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】簡単な手順で、高価なPEラインを必要以上に無駄に使い破棄すること無く、安全で容易に結線前の準備が可能であり、回転振れがなく、余分なラインを巻き込むことなく確実に結線作業が行え、仕上げ作業時においては糸滑りがなく、断線もなく、素早く簡単に完璧に完了でき、結線後の残り糸の除去が容易に行え、小形で携帯し易い釣り糸の結線用具を提供する。【解決手段】釣り糸の結線用具100は、軸1と、リング2と、リング2の抜け防止の止め環3を有し、軸1に穴aが軸方向に貫通しており、軸1の外形とリング2の内径はテーパである。メインラインmを穴aを貫通させて、軸1の外周とリング2の穴の隙間に入れて、リング2をスライドさせることでメインラインmを軸1とリング2に圧着させて、軸1とリング2を自己保持させた状態で結線用具100を回転させ、遠心力でメインラインmをリーダラインの外周に編込み締込む。【選択図】図4