PURPOSE: To raise a rotational bracket, and to improve the elevation of a roof panel by providing a shoe on the rotational bracket of a front support bracket, and by moving a driving body forward and backward with the shoe abutted on a stopper of a guide rail.

CONSTITUTION: Each shoe 13, 14 that is supported and guided by a guide rail is arranged on one side of each front/back support bracket 9... that is protruded from a roof panel 8 to the lower part, while a driving body 35 supported and guided by a cable guide 34 is arranged on the other side. Engaging parts 40, 41 of the driving body 35 are engaged with long holes 29, 30 of the front support bracket 9. The front support bracket 9 is composed of a fixed bracket 21 and a rotational bracket 22, and each shoe 13, 14 is abutted on the rotational bracket 22. The shoe 13 is abutted on a stopper 43 of a front guide rail 16, whereby the rotational bracket 22 is brought down to the front, is raised and guided around the shoe 13, following the movement of the driving body 35 forward and backward.