Disclosed is a structure in which no gap that allows water entry between a weather strip and a glass run is formed in a situation where the weather strip at an upper frame portion of a window frame extends gradually downwardly apart from the glass run. An upper glass run portion is provided with a door panel sealing lip. The door panel sealing lip is provided with a gradually varying portion such that a downward protruding length of the door panel sealing lip increases. The gradually varying portion is disposed so as to contact an outer sealing lip of the weather strip.