To provide a cutting apparatus which can accurately achieve various image data and detected data necessary for cutting work by preventing the dirt of a light receiving lens, etc. of a lens instrument such as an optical sensor, due to chips, and further by easily removing the chips even if the chips have stuck to the light receiving lens.

In order to suppress the sticking of chips, a light emitting lens 64 and the light receiving lens 65 of the optical sensor 60 for setting-up, and the respective surfaces of the respective covers 76, 86 of a camera unit 70 for photographing the wear, chipping, etc. of the cutting edge 32 of a rotary blade 30, are coated with a hydrophilic coating material.