PURPOSE: A blade for a grass mower is provided to prevent safety accidents during a weeding work by pushing grass forward. CONSTITUTION: A blade for a grass mower comprises a coupling hole(11) and a cutting blade(14). The coupling hole is formed to insert a driving shaft of a rotating unit and fixes a blade. In the cutting blade, a lower cutting incline is formed along the lower edge thereof and an upper cutting incline is formed on the top thereof. In the upper and lower edge of the coupling hole, a contact surface(18) with a constant thickness is formed.본 발명은 회전되는 칼날이 원, 반원 또는 타원 형태의 곡면을 갖도록 하여, 곡면진 칼날이 장애물에 부딪치는 경우 전방으로만 튕겨지거나 밀어내면서 풀이나 잡초 등을 절단하여 예초 작업시 안전사고를 미연에 방지할 수 있는 예초기용 칼날에 관한 것이다.
