Parting blade, comprising: two mutually opposite and mutually parallel longitudinal sides (20, 22) which extend between two mutually opposite clamping sides (24, 26) and two mutually opposite end sides (28, 30), wherein the longitudinal sides (20, 22) and the clamping sides (24, 26) run parallel to the longitudinal direction of the parting blade, and the end sides (28, 30) run transversely to the longitudinal direction of the parting blade, wherein each clamping side (24, 26) has at least one bevelled or wedge-shaped clamping face (24', 26') which, for clamping and longitudinally guiding the parting blade in a parting blade mounting, runs parallel to the longitudinal direction; a first cutting insert receptacle which is disposed on one of the two end sides (28, 30) of the parting blade; a cutting insert which is able to be releasably fastened in the first cutting insert receptacle; a coolant duct having a first duct part which extends between a holder inlet opening that is disposed on one of the two longitudinal sides (20, 22), and a holder outlet opening that opens into the first cutting insert receptacle, and having a second duct part which in the interior of the cutting insert extends between a cutting insert inlet opening and a cutting insert outlet opening, wherein the holder outlet opening and the cutting insert inlet opening at least partially overlap one another such that, when the cutting insert is fastened in the first cutting insert receptacle, the first duct part transitions directly into the first duct part; wherein the first cutting insert receptacle has an upper clamping jaw for bearing on an upper side of the cutting insert, as well as a lower clamping jaw for bearing on a lower side, opposite the upper side, of the cutting insert; wherein the cutting insert has a holder-proximal end side and, opposite thereto, a workpiece-proximal end side, said end sides (68, 70) each running transversely to the upper side and the lower side of the cutting insert, wherein a blade edge of the cutting insert is disposed at the transition between the upper side and the workpiece-proximal end side; characterized in that the cutting insert, when the cutting insert is fastened in the first cutting insert receptacle, by way of the upper side, the lower side and the holder-proximal end side bears on the first cutting insert receptacle, and wherein the cutting insert inlet opening is disposed on the holder-proximal end side of the cutting insert. two mutually opposite and mutually parallel longitudinal sides (20, 22) which extend between two mutually opposite clamping sides (24, 26) and two mutually opposite end sides (28, 30), wherein the longitudinal sides (20, 22) and the clamping sides (24, 26) run parallel to the longitudinal direction of the parting blade, and the end sides (28, 30) run transversely to the longitudinal direction of the parting blade, wherein each clamping side (24, 26) has at least one bevelled or wedge-shaped clamping face (24', 26') which, for clamping and longitudinally guiding the parting blade in a parting blade mounting, runs parallel to the longitudinal direction; a first cutting insert receptacle which is disposed on one of the two end sides (28, 30) of the parting blade; a cutting insert which is able to be releasably fastened in the first cutting insert receptacle; a coolant duct having a first duct part which extends between a holder inlet opening that is disposed on one of the two longitudinal sides (20, 22), and a holder outlet opening that opens into the first cutting insert receptacle, and having a second duct part which in the interior of the cutting insert extends between a cutting insert inlet opening and a cutting insert outlet opening, wherein the holder outlet opening and the cutting insert inlet opening at least partially overlap one another such that, when the cutting insert is fastened in the first cutting insert receptacle, the first duct part transitions directly into the first duct part; wherein the first cutting insert receptacle has an upper clamping jaw for bearing on an upper side of the cutting insert, as well as a lower clamping jaw for bearing on a lower side, opposite the upper side, of the cutting insert; wherein the cutting insert has a holder-proximal end side and, opposite thereto, a workpiece-proximal end side, said end sides (68, 70) each running transversely to the upper side and the lower side of the cutting insert, wherein a blade edge of the cutting insert is disposed at the transition between the upper side and the workpiece-proximal end side; characterized in that the cutting insert, when the cutting insert is fastened in the first cutting insert receptacle, by way of the upper side, the lower side and the holder-proximal end side bears on the first cutting insert receptacle, and wherein the cutting insert inlet opening is disposed on the holder-proximal end side of the cutting insert.