To provide a cutting blade rotor in which a flexible linear blade is made resistant to be detached, when the blade is mounted and used for mowing and it is made simply detachable, for example, when the flexible linear blade is exchanged by a worker.

In this cutting blade rotor 11 that is equipped with the flexible linear blade 13 and is used by fitting to a bush cutter 12, a disc body 14 that is allowed to rotate by the bush cutter 12, two projections 17 set on the upper face 14a of the disk body 14, totally two pairs of insert through holes 18, 18, through which the flexible linear blade 13 is passed from the rotary center side on individual projections 17 toward outside, and a bending projection 19 for bending the flexible linear blade 13 that is exposed from openings 21, 21 on the boss side that are opened on the upper face 14a of the disc body between the openings 21, 21 and then the folding part 31 of flexible linear blade 13 is peeled from the upper face 14a of the disk body 14.