CUTTING DEVICE

An object of the present invention is to provide a cutting device capable of efficiently removing and removing a cutting blade with respect to a supporting flange. According to the present invention， the cutting means of the cutting device includes a support flange mounted on the distal end of the spindle， a cutting blade detachably supported on the support flange， and a fixing flange for fixing the cutting blade supported on the support flange. The support flange includes: a boss portion into which an opening formed in the center of the cutting blade is inserted， a collar portion integrally formed on the outer circumference of the boss portion， and supporting a surface of the cutting blade and the spindle It includes a cylindrical portion fitted to the front end portion， the collar portion of the support flange is formed with a suction hole opened to the fixed flange side， the cylindrical portion of the support flange communicating with the suction hole A communication hole is formed， and the communication hole is a rotary joint fixed to the spindle housing and an on-off valve Through is selectively in communication with the suction source.