PURPOSE: To reduce the number of parts and simplify the assemblage work by forming a gutter arranged on a bulging-out part which is formed integrally in separation from a guide rail, integrally with the functional part, from resin.

CONSTITUTION: A guide part 31 which extends in the longitudinal direction of a vehicle and a bulging-out part 32 are molded integrally through a separated body, on a guide rail 3 which is arranged on both the sides of an opened port part and fixed on a roof panel 1, and a gutter 9 is arranged under the boundary between the roof panel 1 and a slide panel 5. The gutter 9 is made of resin, and at a side 92, the functional parts such as a flange part 92a, erecting wall 92b, insertion part 92c for guiding the free edge of a cable 6, and a block body 92d for assisting the tilt-up/down at the regular position of the roof panel 1 are integrally molded. Accordingly, the number of parts and the bracket, etc., for installing the functional parts can be reduced, and the assemblage work is simplified, and cost reduction can be realized.