A weather strip is attached over the entire surrounding part of a door opening of a vehicle. The weather strip is formed by extrusion-molding, and has a trimming portion having a substantially U-shaped cross section and a hollow seal portion. A first projection portion and a second projection portion are formed on an outer face of an outer side wall part of the trimming portion in such a way as to extend to the outside of the vehicle. The seal portion has an end part connected to a leading end part of the first projection portion, and also has the other end part connected to a leading end part of the second projection portion. The second projection portion is placed at the side of an outer periphery of the weather strip, that is, at the side at which an amount of bending-deformation increases when the corner portion of the weather strip is formed. The second projection portion has a thickness along the outer side wall part and a projection length, each of which is larger than a thickness of a general part of the seal portion. A sponge layer extending from the seal portion may be provided on an outer surface side of the second projection portion.