A sliding block guide for openable motor vehicle roofs or vehicle hatches, with a guideway which has a guide channel (40), and a sliding block (11) which is movably guided in the guide channel along the guideway, the guideway has at least one essentially linear guideway area (47, 48) and at least one curved guideway area (49). To improve the curve handling capacity of the sliding block, the guide channel (40) is made wider in the area of the curved areas (49) of the guideway (12) than in the area of the essentially linear guideway areas (47, 48).