An automotive extrusion-molded product includes a core material (2) having a U-shaped cross section which is made of a hard synthetic resin. The core material has cut portions (7, 8) with various shapes extending in the lengthwise direction. A coating body (3) made of a soft synthetic resin is adhered to the core material so as to cover the core material. The coating body (3) is provided with a pushed-in portion (5) formed integrally with the coating body and extending downward beyond the end portion (4, 4) of the core material so as to be pushed in toward an inner peripheral surface (14) having a U-shape cross section of the core material. The pushed in portion (5) is provided with a plurality of holding members (6, 6) which project to the outside of the pushed-in portion and are disposed so as to opposed to each other within a space formed by the inner peripheral surface having a U-shape cross section of the core material when the pushed-in portion is pushed into the space formed by the inner peripheral surface of the core material.