PROBLEM TO BE SOLVED: To provide a tilling claw superior in reversibility, plowing properties and soil crushing properties, the tilling claw that mitigates general load change particularly in tilling and can maintain tilling performance even in any kind of soil.SOLUTION: A tilling claw includes: a base part (1) installed in a rotational claw shaft (S)； a vertical blade part (2) to a horizontal blade curve starting part (F) continuously extended from the base part (1) to the vertical lower part； and a horizontal blade part (3) curved in the direction opposite to the rotation direction from the vertical blade part (2), and comprising a curved plate curved in one direction to the base part (1) and continuously extended using the horizontal blade curve starting part (F) as a boundary. The vertical blade part (2) and the horizontal blade part (3) are characterized by including a back side curve region curved to the one direction side from the cutting edge side to the back side.SELECTED DRAWING: Figure 1【課題】 反転性、すきこみ性、砕土性に優れた耕耘爪であって、特に耕耘時における全体的な負荷変動を緩和するとともに、如何なる土壌であっても耕耘性能を維持することができる耕耘爪を提供する。【解決手段】回転爪軸（Ｓ）に装着される基部（１）と、前記基部（１）から鉛直下方に連なって伸びる横刃部湾曲開始部（Ｆ）までの縦刃部（２）と、前記縦刃部（２）から回転方向と逆方向に湾曲するとともに、前記基部（１）に対して一方向に湾曲してなり、前記横刃部湾曲開始部（Ｆ）を境として連なって伸びる湾曲板からなる横刃部（３）とを備えてなり、前記縦刃部（２）と前記横刃部（３）は、刃縁側から背部側にかけて前記一方向側へと湾曲する背部側湾曲領域を備えることを特徴とする耕耘爪。【選択図】 図１
