Weather strip and production method thereof

A method for producing a weather strip including

• an extrusion molded extrusion molded portion;
• an injection molded portion which is formed by a molding device having a plurality of mold members and connects both ends of the extrusion molded portions in a straight line shape;
• a mounting base portion which is mounted on a circumferential edge of an opening of a body or a circumferential edge of an opening/closing member for opening and closing the opening;
• and
• a hollow sealing portion which protrudes from the mounting base portion, and is pressed against an opposite member when the opening/closing member for opening and closing the opening is closed,
• wherein in a core mold member having a core body for forming an inner peripheral surface of a hollow sealing portion of the injection molded portion, and a holding portion protruding from the core body, in a state in which both ends of the core body are inserted into a terminal of the hollow sealing portion of the extrusion molded portion when the injection molded portion is formed, the core mold member is positioned at a predetermined position of the molding device such that a connecting width of the injection molded portion in a longitudinal direction of the weather strip is 0.5 mm or more and 3.0 mm or less, the mold member is closed to form a cavity in the molding device, and the cavity is filled with a material of the injection molded portion to form the injection molded portion;
• the injection molded portion is provided with a core withdrawing hole, through which the core body is withdrawn by at least the holding portion after the core body is formed, such that a length thereof along a circumferential direction of the inner peripheral surface of the hollow sealing portion is 25% or more and 45% or less of a circumferential length of the inner peripheral surface in a region of the hollow sealing portion except for a sealing surface which is pressed against the opposite member;
• and
• after the injection molded portion is formed and the mold member of the molding device is opened, the core body is withdrawn from the core withdrawing hole.