Misalignment of a weather strip is controlled by a corner formed by a shoulder part and a lower inclined part formed in an edge portion of an opening of a roof. A locating face of a sealing part is pressed onto the shoulder part on one side of the corner, and a locating face of an inclined extension part is pressed onto the lower inclined part on the other side of the corner. The sealing part is adhered to at least one of the shoulder part or the upper inclined part with a double-sided tape.