Abstract: A built-up camshaft with a shaft body, on which separately produced cams are fixed, is described. In order to achieve that the individual cams can be made with the greatest accuracy and also with concave circumferential areas or running surfaces, and at the same time the shaft body can be balanced in a manner which is optimal from the viewpoint of vibration, a shaft body is provided, which is produced by casting, forging or the like. Except for the cams, all functional elements, such as sprocket mountings, axial bearings and position transmitters, can be formed in one piece on the shaft body during its manufacture.