Abstract: A device is shown for fixing blades of a turbo-machine having a plurality of blades positioned longitudinally relative to a mounting groove. At least two blades are positioned adjacent to each other inside the mounting groove, and a mounting gap is defined between the blades. Two insertion elements constructed as collar halves can be inserted into the mounting gap, and each insertion element has a width adapted to the width of the mounting gap such that a gap space is defined between the insertion elements when they are inserted into the mounting gap. A wedge element can be inserted in the mounting gap to fix both collar halves inside the mounting groove. At least one connecting element is provided on the wedge element towards the side of a blade, and at least one of the two blades adjoining the wedge element is provided with a mating recess corresponding to the connecting element so that the wedge element and the blade are connected by a shape-mated connection.