A glass run comprises: a vertical run including a vehicle outside seal lip, a curved seal lip, and a coupling portion through which the vehicle outside seal lip and the curve seal lip are coupled to each other; and an inclined run including the vehicle outside seal lip, the curved seal lip, a hollow lip having a hollow, and a coupling portion through which the vehicle outside seal lip, the curve seal lip and the hollow lip are coupled to one another. The vertical run and the inclined run are formed as one unit by molding in such a manner that the vertical run and the inclined run are joined obliquely. The coupling portion of the vertical run has a shift preventing protrusion on the rear surface thereof, and the door sash has an opening which is engageable with the protrusion, so that the inclined run is prevented from being shifted.