A weather strip for sealing a window frame or the like of a vehicle including a straight portion connected to a corner portion having a bent form and a tortuous hollow portion formed in the corner portion is provided. A slit is formed at an opening of the tortuous hollow portion, for example, a circumferential edge of a core drawing the hole for drawing core which form the hollow portion. Consequently, the core drawing hole can be opened easily and the core can be smoothly drawn.