A rotor for an asynchronous electric machine with nonthrough shaft comprising two half-shafts (11, 12) enclosing a cylindrical magnetic mass and two short-circuit disks each interposed between a half-shaft and one of the ends of the cylindrical magnetic mass, each half-shaft comprising at least one first retaining means, each short-circuit disk comprises on each of its faces at least one second retaining means and each end of the magnetic mass comprises at least one third retaining means, the first, second and third retaining means cooperating with each other so as to prevent relative movement of the short-circuit disks with respect to the half-shafts and with respect to the magnetic mass, characterised in that: the first retaining means and the third retaining means each comprise a countersink (17, 20) and the second retaining means comprises a retaining pin intended to be inserted into the countersink, or the first retaining means and the third retaining means each comprise a retaining pin (25, 27) and the second retaining means comprises a countersink intended to accommodate the retaining pin, or the first retaining means comprises a retaining pin, the third retaining means comprises a countersink, the second retaining means of a first face of the short-circuit disk comprises a countersink and the second retaining means of a second face of the short-circuit disk comprises a retaining pin so that each retaining pin is inserted into an adjacent countersink, or the first, second and third retaining means each comprise a countersink cooperating with removable retaining pins, or the first retaining means comprises a blind hole made in the half-shaft, the second retaining means comprises a hole made in the short-circuit disk so that the short-circuit disk is traversed by the hole and the third retaining means comprises a hole made in the magnetic mass so that the magnetic mass is traversed by the hole, a removable retaining pin being inserted with or without clearance into the holes. the first retaining means and the third retaining means each comprise a countersink (17, 20) and the second retaining means comprises a retaining pin intended to be inserted into the countersink, or the first retaining means and the third retaining means each comprise a retaining pin (25, 27) and the second retaining means comprises a countersink intended to accommodate the retaining pin, or the first retaining means comprises a retaining pin, the third retaining means comprises a countersink, the second retaining means of a first face of the short-circuit disk comprises a countersink and the second retaining means of a second face of the short-circuit disk comprises a retaining pin so that each retaining pin is inserted into an adjacent countersink, or the first, second and third retaining means each comprise a countersink cooperating with removable retaining pins, or the first retaining means comprises a blind hole made in the half-shaft, the second retaining means comprises a hole made in the short-circuit disk so that the short-circuit disk is traversed by the hole and the third retaining means comprises a hole made in the magnetic mass so that the magnetic mass is traversed by the hole, a removable retaining pin being inserted with or without clearance into the holes.