PROBLEM TO BE SOLVED: To provide a cutting blade excellent in durability.SOLUTION: A cutting blade (1) comprises a first surface (3a) and a second surface (3b), a tip (3c) is formed of the first surface (3a) and the second surface (3b), and the first surface (3a) and the second surface (3b) comprise on a surface, a coating layer (4). When a plane along a direction (D) where the cutting blade (1) cuts a farm crop, and passes the tip (3c) is a first plane (P), a first angle (α) formed of the first surface (3a) and the first plane (P) and a second angle (β) formed of the second surface (3b) and the first plane (P) are different from each other.SELECTED DRAWING: Figure 2【課題】耐久性に優れた切断刃を提供する。【解決手段】切断刃（１）は、第１面（３ａ）と第２面（３ｂ）とを有し、第１面（３ａ）と第２面（３ｂ）とにより刃先（３ｃ）が形成されており、第１面（３ａ）および第２面（３ｂ）は、表面に被覆層（４）を有し、切断刃（１）が農作物を切断する方向（Ｄ）に沿った平面であって、刃先（３ｃ）を通る平面を第１平面（Ｐ）とした場合に、第１面（３ａ）と第１平面（Ｐ）とがなす第１角度（α）と、第２面（３ｂ）と第１平面（Ｐ）とがなす第２角度（β）とが異なる。【選択図】図２
