There is disclosed a roof system for a vehicle having a roof opening (1) in a roof part (2,2'). An operating mechanism comprises a first device (5) including a lever (16) and a second device (6) including a lever (7) for moving the front and rear edge of a closure towards a raised position. At least one of the levers (7;16) has, at a first end, a first pivotal connection (9;18) to the closure, and, remote from the first end, spaced second and third connections (8,10;17,19) connecting the respective lever at least to a guiding slide (14). At least one of the levers (7;16) is pivotally connected to a sliding member (22) at one of said second and third connections (8,10;17,19). The sliding member (22) is separate from the guiding slide (14) and is supported by a guide rail in directions perpendicularly to the longitudinal sliding direction.