A torsional vibration canceler for use on the outer periphery of a shaft which rotates about an axis and includes two enlargements. The torsional vibration canceler includes half-shells that can be pressed onto the outer periphery of the shaft and which are connected, by way of spring elements that can be deformed in the peripheral direction, to at least two inertial masses configured as segments of a circle. The inertial masses are connected to one another by a retaining elements, preferably in the form of at least one ring which surrounds the inertial masses radially and externally. The ring has an inside diameter which is greater than the diameter of at least the smallest of the enlargements.