The present invention relates to a roller machine which is used for rolling a roller machine unit of metal tubes, metal rods or metal wires. The roller machine has at least three starlike rollers which surround a roller shaft. Every roller is rotatably installed in an eccentric lining via the roller shaft and a first roller shaft. The rolling roller machine unit is rotatably installed in a machineframe housing of the roller machine via a second roller bearing so that the roller can be installed in the machine frame housing in a manner that the axial line of the roller is radially adjustable,thus adjusting the opening diameter of the roller object. The second roller bearing is only extended circumferentially on a first part of the periphery of the eccentric lining, so that the eccentric lining can be installed on a second part on the periphery thereof in a sliding manner.