PURPOSE: To secure sufficient glass sealing pressure in the die molded corner part of a hollow roof side weatherstrip and prevent a seal part from being permanently deformed into a crushed shape by long-term use.

CONSTITUTION: A hollow roof side weatherstrip is provided with a base part 31 locked to a retainer 5, and a seal wall 320 connecting both ends of the base part 31 while being pressed by a door glass 2 at the time of closing a door. In the molded corner part of this roof side weatherstrip, a protrusion 34 is formed on the inner surface more on the interior side than the door glass contact position of the seal wall 320, and a protrusion 35 opposed to the protrusion 34 is formed at the base part 31. When the door glass 2 is pressed to the seal wall 320, the protrusions 34, 35 support the seal wall 320 so as to prevent the excessive deformation of the whole seal wall 320. As to the protrusions 34, 35, only either one of them may be formed instead of both.