PURPOSE:To obtain improved sealing by forming a door weatherstrip with an extension and connecting the extension with a glass run and further to improve mounting operativity by forming pocket portions at the connection of the extension and glass run. CONSTITUTION:A right-angled triangular corner piece 13, disposed at the front end of a waist portion 11a of a sashless front door 11 for substantially closing a corner portion 12a of a window opening 12, is composed of a channel plate 15 welded to a base plate 14 integrally formed with the door 11 and inner and outer covers 16, 17 of resin attached thereto. A door weatherstrip 22 mounted to the door peripheral portion 11b has an extension 22a which is tightly held by front side edges 16c, 17c of the covers 16, 17. The upper end of the extension 22a and the upper end of a glass run 19 are connected at upper end corner portions 16d, 17d of the covers, and the above corner portions 16d, 17d are inserted into the connection 23 to form pocket portions 23a, 23b for holding the corner portions.
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