PROBLEM TO BE SOLVED: To provide a tillage claw having improved soil crushing property and abrasion resistance as compared with the current tillage claw. SOLUTION. The work claw according to the present invention has a mounting portion that can be attached to the claw shaft, a vertical blade portion that extends from the mounting portion along a plane intersecting the rotation center of the claw shaft, and a blade having a curved end portion that cuts into the soil. It has a horizontal blade portion extending from the vertical blade portion while being curved in the direction of the claw shaft while having an edge portion, and has a tangent line at an arbitrary point of the blade edge portion, and the arbitrary point and the claw shaft. In the depth of cut that is the marginal angle between the straight line connecting the center of rotation and the center of rotation, the depth of cut in the vicinity of the cutting edge of the horizontal blade is the said at the boundary between the vertical blade and the horizontal blade. It is 50% or more and 60% or less of the cutting angle. [Selection diagram] Fig. 2【課題】現行の耕耘爪に比べて砕土性及び摩耗耐性が向上した耕耘爪を提供する。【解決手段】。本発明による作業爪は、爪軸に取り付け可能な取付部と、前記爪軸の回転中心に交差する平面に沿って前記取付部から延びる縦刃部と、土壌に切り込む端部に曲線を有する刃縁部を備えつつ、前記爪軸の方向に湾曲しながら前記縦刃部から延びる横刃部と、を有し、前記刃縁部の任意の点における接線と、前記任意の点と前記爪軸の回転中心とを結ぶ直線と、のなす角の余角である切込角において、前記横刃部の刃先近傍における前記切込角は、前記縦刃部と前記横刃部との境界における前記切込角の５０％以上６０％以下である。【選択図】図２
