PURPOSE: To enable a movable roof to be smoothly opened or closed by lining the movable roof, with the rubber positive-motion band body of a length which is almost equal to the moving length of said roof in the moving direction of thee roof, and by engaging the positive motion ring of a driving motor fixed on a fixed frame body, with the band body.

CONSTITUTION: The driving motor M of a driving body 20 fixed on a fixed frame body 5 is rotated forward or reversely. After that, a rubber positive- motion band body 9 lined to be erected at both ends of the frame body of the lower end section of a movable roof 2 is driven by the driving ring 11 of the motor M, and the roof 2 is moved to be released or closed. After that, a dog 12 fitted at the lower end of the roof 2 is brought in contact with limit switches LS1, LS2. It is turned into the opening or closing end of a stroke L.