To reduce splash of water that has entered a gap between an upper end of a door and a vehicle body onto a locked portion. A part of a vertical side sealing portion 4 from a part including a water inlet 71 to at least a part above a hollow portion R3 is a die-molded portion. In the die-molded portion, a core removing hole 79 for removing a core used in molding is open at a cabin outer side relative to an attachment plate 80. A guide portion 90 for guiding water that has entered from the water inlet 71 to a cabin inner side relative to the core removing hole 79 is provided above the core removing hole 79 on the inner surface of the hollow portion R3.