The present invention relates to a blade for a reaper, which comprises: an assembly part having a connection hole a first blade part having an upper side which is extended from an upper portion on a right side of the assembly part to constitute a first machining unit and is horizontal like an upper side portion of the assembly part, and a lower side which faces the upper side and is configured to become gradually far from the upper side toward the outside a second blade part having a lower side which is extended from a lower portion of a left side of the assembly part to constitute a second machining unit and is horizontal like a lower side portion of the assembly part, and an upper side which faces the lower side and is configured to become gradually far from the lower side toward the outside a first auxiliary blade part which protrudes on a downwardly inclined cut surface facing a third matching unit heading the first blade part on the upper side portion of the assembly part, has a fifth machining unit parallel with the left side of the assembly part on a lateral surface, and is bent toward the connection hole and a second auxiliary blade part which protrudes on an upwardly inclined cut surface facing a fourth machining unit heading the second blade part on the lower side portion of the assembly part, has a sixth machining unit parallel with the left side portion of the assembly part on a lateral surface, and is bent toward the connection hole. According to the present invention, the auxiliary blade parts provided in the blades of the reaper cut grasses before the grasses become stuck between a gear case and the blades or twined around the gear case. Thus, it is possible to improve the efficiency of work, reduce the time of the work, and provides highly improved safety and convenience to a user.COPYRIGHT KIPO 2015본 발명은 예취기 날에 관한 것으로서, 연결공이 구비되는 조립부와, 조립부 우측면부 상의 상측부위에서 연장되며 제1가공부로 구성되는 상측면은 조립부의 상측면부와 동일하게 수평을 이루고 상측면과 대향되는 하측면은 바깥쪽으로 갈수록 상측면과 점차 멀어지도록 구성되는 제1날부와,
