(Task) Suppression of cutting debris and the occurrence of so-called scuffing phenomenon are suppressed. (Solution means) A flange mechanism for attaching a disk-shaped base having a mounting hole in the center and a cutting blade having a cutting edge formed at the outer circumferential edge of the base to a spindle serving as a rotating shaft, and a cylindrical shape extending in the front-rear direction. And a boss portion having an O-ring mounting groove on the front side of the outer circumferential surface on which the O-ring is mounted, and a support surface protruding radially outward from the rear side of the boss portion, supporting the base of the cutting blade and facing the front side A flange portion having a, and a spindle mounting hole formed inside the flange portion and into which the tip end of the spindle is inserted, and an O-ring having an outer diameter larger than the diameter of the mounting hole of the base is mounted in the O-ring mounting groove. The boss part is inserted into the mounting hole of the base, and the O-ring is brought into contact with the inner circumferential surface of the base to support the cutting blade.
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