The invention relates to a drive unit (10) for a displaceable slide wing (30) that can be affixed to the slide wing (30), comprising a drive motor (11) and a gearbox (16, 17, 18) coupled thereto, the output drive element (18) thereof being rotationally fixedly connected to at least one roller (14), wherein the roller (14) can be inserted in a stationary guide rail (31) of the slide wing (30), wherein the drive motor (11) of the drive unit (10) is a brushed or brushless DC external or internal rotor or a shrunk-on-disc motor having a drive spigot (19), and/or the power supply of the drive motor (11) is provided by means of a voltage source (36) that can be inserted in the slide wing (30).