rotary blade rotates is attached to a rotating blade mounting shaft 14 of the mowing machine a holding member 100 for the base end side is held by the holding member 100, the front end side and the cord-shaped cutting member 4a of the lead-out hole 123 are allowed to lead radially outward provided on the holding member 100, the retaining member 100 between the relative rotatable guide member 200 about its rotational axis relative to the holding member 100 in the lower, and a said outlet hole 123, so that the outer end is lower with respect to the inner end and it is tilted to. The guide member 200, and a general portion, the general portion and has a disc shape having an outer peripheral portion which is displaced upward relative to, and a plurality of recesses 240 are formed on the outer periphery thereof.回転刃は、草刈機の回転刃取付け軸14に取付けられて回転させられる保持部材100と、上記保持部材100に基端側が保持され、先端側が当該保持部材100に設けた導出孔123から半径方向外方に導出させられたコード状切断部材4aと、上記保持部材100の下位において当該保持部材100に対してその回転軸心を中心として相対回転可能なガイド部材200と、を備え、上記導出孔123は、その内方端に対して外方端が下位となるように傾斜させられている。上記ガイド部材200は、一般部と、この一般部に対して上方に変位している外周部とを有する円板状をしており、また、その外周に複数の凹部240が形成されている。
