A grass cutter blade of the present invention inclines: a connection part for connection to a grass cutter and a peripheral part extending from the connection part as a center and having an outer periphery that is inclined downwardly. The peripheral part is provided with a plurality of cutouts, each of which has an opening at the outer periphery. The peripheral part includes a region located further away from a rotation axis of the blade than an edge portion of each of the plurality of cutouts. There exist, in the edge portion, a first and a second end sections which extend to a deepest section, the first and second end sections pass through respective regions during rotation of the blade, and a distance exists between the respective regions in a direction orthogonal to the rotation axis with respect to a predetermined range in an up-and-down direction.
