A glass run couples to an outer-cabin side of a frame and includes a body and an installation member. The body includes an outer-cabin side wall, an inner-cabin side wall and a glass run side wall. The installation member is assembled on a flange having a plurality of elevated parts formed at regular intervals, has a substantially U-shaped cross-section including the glass run side wall, a body side wall and a connecting wall and has an anchoring part formed on an inner side for receiving the plurality of elevated parts on the flange. A thin part is formed by providing a concave part on an inner side of a connecting part between the body side wall and the connecting wall of the installation member.
