The present invention relates to long cast heavy lures and water flow resistance plate is landing on the surface of the water , to provide a tangle prevention tool tangle will not occur in a recess of the water flow resistance plate even if the line is crossed . A providing a line hole 1 in the center of the yarn winding prevention member 3 , supporting arms 2 which fits in the support hole 6 of the flow resistance plate 4 is provided at both ends . Length from the support arm 2 provided at both ends of the tangle prevention device 3 to line hole 1 , the support length from the support hole 6 of the arm 2 fits water flow resistance plate 4 until the recess line hole 8 and equal to or greater than the provided to be of the length .BACKGROUND .【課題】遠投し重量物疑似餌と水流抵抗板が水面に着水し、ラインが交差しても水流抵抗板の凹部で糸絡みが発生しない糸絡み防止具を提供する。【解決手段】糸絡み防止具3の中心にライン孔1を設け、両端には水流抵抗板4の支持孔6に収まる支持腕2が設けられている。糸絡み防止具3の両端に設けられた支持腕2からライン孔1までの長さは、支持腕2が収まる水流抵抗板4の支持孔6から凹部ライン孔8までの長さと同等かそれ以上の長さとなるように備わる。【選択図】図1