A cutting machine equipped with a cassette placing unit having a cassette table for placing a cassette storing a workpiece supported to an annular support frame via an adhesive tape. The cassette placing unit comprises an ultraviolet light irradiation unit which is disposed below the cassette table, stores a workpiece supported to the support frame by the adhesive tape and irradiates the adhesive tape with ultraviolet rays and an ascending and descending mechanism which positions the cassette placed on the cassette table at a first workpiece carrying-in/carrying-out position which is located in the carrying-in/carrying-out area for the workpiece carrying-in/carrying-out means and the ultraviolet light irradiation unit at a second workpiece carrying-in/carrying-out position which is located in the carrying-in/carrying-out area for the workpiece carrying-in/carrying-out means.