Abstract: An apparatus for kneading portioned dough pieces comprises a drum (2) rotating around a horizontal axis and being provided on its periphery with alternatively disposed receiving openings (3,4) of different size for the dough to be kneaded. In each receiving opening (3,4) a piston (43) is guided in radial direction and a restricted guidance (48) is provided for the adjustment of these pistons. A change-over means (50) enables one to position always only one of the two sizes of the receiving openings (3,4) below the kneading device (25), so that this kneading device is common of all sizes of the receiving openings (3,4). Thereby, dough pieces having a large range of weight can be kneaded (FIG. 1).