Cutting for harvester

The invention relates to a cutter for a harvesting machine comprising an elongate knife back (1), at least one arranged thereon cutting blades (2; 3) and a fastening element (10) for fixing the knife back (1) on a harvesting machine. The invention solves the object to provide a cutting unit which allows an as long as possible damage and maintenance-free operation of the cutting unit, characterized in that between the knife back (1) and fixing element (10) is a vibration damper (7) is provided.