To increase durability of a mounting part (4) in which a cutting blade piece (32) is mounted on a bladed disk (31) and reduce a replacement frequency of consumable components. Moreover, to prevent the cutting blade piece (32) from being fixed by twined mowed grass and prevent deformation and damage of the cutting blade piece (32).There is provided a lawn mower (1) in which an operating part (3) that performs lawn mowing is equipped in a traveling machine body (2) that travels in a field. The operating part (3) comprises a rotary-driven bladed disk (31) in a state of facing the field, and a cutting blade piece (32) rockably mounted on an outer peripheral part of the bladed disk (31). A mounting part (4) in which the cutting blade piece (32) is mounted on the bladed disk (31) comprises an axial member (40) mounted to cross a field opposed surface of the bladed disk (31), and a cylindrical member (41) which is hollow and into which the axial member (40) is inserted with a space therebetween. The axial member (40) is mounted on the bladed disk (31) in a state in which the cutting blade piece (32) is fixed to an outer periphery of the cylindrical member (41) and the axial member (40) is inserted into the cylindrical member (41).
