PROBLEM TO BE SOLVED: To prevent collision of foreign matter such as stones with a cover while being able to supply soil scraped up by a tilling claw portion to a position where it is actively scraped up and to the front side of the tilling claw portion. Prevent damage to the cover. SOLUTION: A cultivating claw part which can be freely driven, an upper cover 151 covering an upper side of the cultivating claw part, and a rear cover 152 covering a rear side of the cultivating claw part are provided, and the upper cover 151 has an upper cover 151. A projecting portion 211 projecting from the 151 side to the rotation locus R side of the tilling claw portion is provided. [Selection diagram] Fig. 4【課題】耕耘爪部にて掻き揚げられた土を積極的に掻き揚げた位置や耕耘爪部よりも前方側に供給することができながら、石等の異物とカバーとの衝突を防止してカバーの損傷を防止すること。【解決手段】回転駆動自在な耕耘爪部と、耕耘爪部の上方側を覆う上部カバー１５１と、耕耘爪部の後方側を覆う後部カバー１５２とが備えられ、上部カバー１５１には、上部カバー１５１側から耕耘爪部の回転軌跡Ｒ側に突出する突出部２１１が設けられている。【選択図】図４
