A ball feeder for a slingshot includes an elongated tube and a ball feeding housing at one end of the tube. The ball feeding housing has an outlet opening which is offset from the axis of the tube. A pair of plungers are reciprocably mounted in the ball feeding housing. Each of the plungers is provided with a ball opening having a diameter substantially the same as the diameter of the tube and an axial dimension less than the diameter of the tube. The total axial dimension of the ball opening is at least as great as the diameter of the bore. At least two different size balls can be fed by the ball feeder. The diameter of one size corresponds to the axial dimension of one of the plungers, and the diameter of the other size corresponds to the diameter of the tube.