A planetary gear includes a central sun gear having external teeth, a ring gear having internal teeth, a planetary carrier having formed therein lubricant supply channels, and planet gears supported on the planetary carrier and having side cheeks engaging the internal teeth of the ring gear and the external teeth of the sun gear. A slide bush radially supports the planetary carrier and has radial outer and inner sliding surfaces, and an interposed shoulder surface, which bear flat upon a radial outer and inner bearing surfaces, and an interposed shoulder surface on an inner surface of the planetary carrier. An annular lubricant distribution channel is formed between the shoulder surfaces of the slide bush and the planetary carrier, with the lubricant supply channels feeding into the lubricant distribution channel on the inlet side and connected to the external lubricant supply via a lubricant supply channel formed in the slide bush.