PURPOSE: To provide sufficient sealing performance obliquely by joining a sealing tongue and the fitting base of a center seal rubber so as to give seal reaction force at the sealing tongue.

CONSTITUTION: A center seal rubber 2 is made up of a fitting base 5 having a fitting groove 4 which is engaged with the front end of a rear door glass and a sealing tongue 7 having a seal lip 6 which is obliquely projected outward from a car, both being made of different materials. A conjunction face 5a of the fitting base 5 to the sealing tongue 7 is formed oblique while a conjunction face 7a of the sealing tongue 7 is inclined at an angle corresponding to the obliqueness of said conjunction face 5a. Both of said members 5 and 7 are thereby provided with conjunction extensions 5b and 7b. The conjunction extension 5b which is made of hard resin is applied to line the conjunction extension 7b which is made of soft resin, hence improving the sealing performance of seal lip 6.