Rigid axle for a motor vehicle, having a spring seat body fastened to the rigid axle, the spring seat body having an upper spring seat surface (13.1), a lower seat surface (13.2), lateral edge surfaces (13.3, 13.4, 13.5, 13.6) located between the spring seat surface (13.1) and the seat surface (13.2), and holding means for holding tensioning means for fastening at least one spring to the spring seat body, wherein the lateral edge surfaces comprise a first edge surface (13.3) and a second edge surface (13.4) which face away from each other and extend transversely to the rigid axle when the spring seat body is fastened on the rigid axle, wherein the first edge surface (13.3), in the fastened state of the spring seat body on the rigid axle, lies closer to an end of the rigid axle, which is suitable for supporting a vehicle wheel, than the second edge surface (13.4), the first edge surface (13.3) having an edge course (13.31) which, in the fastened state of the spring seat body on the rigid axle, lies in overlap with the rigid axle, and the spring seat body being welded to the rigid axle, characterized in that the spring seat body is carried-out as a forged part, and in that said edge course (13.31), viewed from above, is formed at least partially as an outwardly projecting, convex edge course (13.31) whose apex or vertex (13.32) lies in a region of the first edge surface (13.3) which runs along a central length range (L13.31) of the upper spring seat surface (13.1) extending transversely to the rigid axle, wherein said central length range (L13.31) is less than one third, preferably less than one quarter, particularly preferably less than one fifth of the length (L13.1) of the upper spring seating surface (13.1), and wherein the spring seat body is welded to the rigid axle in that one or more weld seams (20, 21) is/are formed at least partially along the outwardly projecting, convex edge course (13.31) of the first edge surface (13.3). a lower seat surface (13.2), lateral edge surfaces (13.3, 13.4, 13.5, 13.6) located between the spring seat surface (13.1) and the seat surface (13.2), and holding means for holding tensioning means for fastening at least one spring to the spring seat body, wherein the lateral edge surfaces comprise a first edge surface (13.3) and a second edge surface (13.4) which face away from each other and extend transversely to the rigid axle when the spring seat body is fastened on the rigid axle, wherein the first edge surface (13.3), in the fastened state of the spring seat body on the rigid axle, lies closer to an end of the rigid axle, which is suitable for supporting a vehicle wheel, than the second edge surface (13.4), the first edge surface (13.3) having an edge course (13.31) which, in the fastened state of the spring seat body on the rigid axle, lies in overlap with the rigid axle, and the spring seat body being welded to the rigid axle, characterized in that the spring seat body is carried-out as a forged part, and in that said edge course (13.31), viewed from above, is formed at least partially as an outwardly projecting, convex edge course (13.31) whose apex or vertex (13.32) lies in a region of the first edge surface (13.3) which runs along a central length range (L13.31) of the upper spring seat surface (13.1) extending transversely to the rigid axle, wherein said central length range (L13.31) is less than one third, preferably less than one quarter, particularly preferably less than one fifth of the length (L13.1) of the upper spring seating surface (13.1), and wherein the spring seat body is welded to the rigid axle in that one or more weld seams (20, 21) is/are formed at least partially along the outwardly projecting, convex edge course (13.31) of the first edge surface (13.3).