Disclosed is a compact shot-treatment machine that enables the quality of a shot treatment for a workpiece to be enhanced, having a tubular portion, without generating dents on the workpiece. The shot-treatment machine comprises a jig 1 having a plurality of axial members 22, each axial member to be passed completely through each tubular portion of one or more workpieces W for holding them, and is detachably mounted on the jig; an enclosure 2 for defining a projection chamber therein; a supporting means 3 for rotatably holding the jig 1 in the projection chamber; a projection device 7 for projecting shots to the workpieces W in the projection chamber; and a circulating mechanism 8 for collecting the shots projected from the projection device 7 and supplying them to the projection device 7.