A weather strip has a trim portion and a seal portion. The trim portion has a vehicle interior side wall, a vehicle exterior side wall, and a connecting portion. A metal insert is embedded in the trim portion. The insert has piece portions and a center bond portion which connects the piece portions to one another. The thickness of each of parts of the insert, which are other than both curved parts, is set to be thinner than the thickness of each of both the curved parts. Thus, the thickness of the insert, except for the curved parts, is small. Consequently, the entire insert, thus, the entire weather strip can be lightened. On the other hand, both the curved parts are relatively thick. Accordingly, the weather strip can assure predetermined strength and stiffness and can easily maintain an initial shape.