The device (1), which is used for cutting an item for processing, in particular a food item (8), comprises at least one cutting tool in the form of a blade (11) which is connected both to a drive device (12) and, via a coupling element (15) and an energy converter (14), to an ultrasonic generator (13). According to the invention, the coupling element (15) and the energy converter (14), optionally also the ultrasonic generator (13), are mounted in such a way as to be able to rotate, and the blade (11), which can be subjected to ultrasonic energy, can therefore rotate.