Guide means for guiding a movement of a furniture part which is accommodated on a basic furniture structure such that it can be moved via the guide means, so that, during normal operation, the furniture part can be moved relative to the basic furniture structure via a movement path such that, irrespective of the position along the movement path, a useful volume in the furniture part and/or the basic furniture structure is accessible or in a closed position of the furniture part, at a standstill relative to the basic furniture structure, the useful volume is concealed, wherein the guide means comprise two spaced-apart and equivalently acting guide units, wherein each guide unit has a movement rail, which can be assigned to the furniture part, and a basic-structure rail, which can be assigned to the basic furniture structure, wherein the movement rail and the basic-structure rail of each guide unit can be displaced in relation to one another, wherein each guide unit has an apparatus with transmission means, wherein the apparatus has a pushing-out arrangement for pushing the furniture part out of the closed position in an opening direction and also a retracting arrangement for retracting the furniture part into the closed position, wherein, in the installed state of the furniture part, for the purpose of cancelling the closed position of the furniture part, the transmission means are present for a synchronous offsetting movement of the two movement rails, wherein the offsetting movement is achieved by the furniture part moving out of the closed position in a closing direction, and wherein the apparatus has adjusting means which are intended for predefining the closed position of the movable furniture part relative to the basic furniture structure and by way of which the furniture part can be adjusted, with a closed position being maintained, along the movement direction provided by the guide means, characterized in that the transmission means have a contact element and a mating element, wherein the contact element and the mating element are designed in the form of interacting elements, wherein the contact element is present on the movement rail, and the mating element is present on the basic-structure rail, of each guide unit, wherein the closed position of the movable furniture part is adjusted by a corresponding adjustment of the movement rail, wherein the contact element is adjusted along with the adjustment of the movement rail, wherein the apparatus has a positioning part, which can be adjusted in two opposite directions, wherein the positioning part is fitted on the basic-structure rail such that it can be offset, wherein the positioning part is designed in the form of a sheet-metal part on which a mechanical stop is present, wherein the positioning part interacts with the mating element, wherein the closed position of the movable furniture part is adjusted by the mechanical stop being adjusted relative to the basic furniture structure, wherein the stop predefines the closed position of the furniture part, wherein the adjusting means are designed such that, coupled to the adjustment of the mechanical stop and therefore of the closed position of the movable furniture part, setting of the position of the mating element takes place, so that the function of the transmission means remains unchanged as the position of the mating element is set.