To provide a herbicidal rotary blade that can be carried out efficiently exchange work of [problem] multiple of the blade body. A attached to the mower in a posture lower surface facing the ground, a base 1 which is rotated about the rotational axis L1 by the driving force of the driving portion of the lawn mower, the proximal end portion 2a base 1 of the first blade body 2 which is located below the peripheral portion, and the second blade body 3 having a base end portion 3a is disposed below the first blade body 2 of the base end portion 2a, the base 1 swingably about a rotation axis parallel to the swing axis L2 comprises a first blade body 2 and the second blade body 3 of the base end portion 2a, a fastener 4 fastening 3a to allow desorption to the base 1, a.FIELD 1【課題】複数の刃体の交換作業を効率良く行うことができる除草用回転刃を提供する。【解決手段】下面が地面に対峙する姿勢で草刈機に取り付けられ、草刈機の駆動部の駆動力によって回転軸線L1周りに回転駆動される基部1と、基端部2aが基部1の周縁部の下方に配置されている第1刃体2と、基端部3aが第1刃体2の基端部2aの下方に配置されている第2刃体3と、基部1の回転軸線と平行な揺動軸線L2周りに揺動可能に第1刃体2及び第2刃体3の基端部2a、3aを基部1に脱着可能に留める留め具4と、を備える。【選択図】図1
