The present invention relates to a gasket attached to the door to prevent cold air leakage between the side door rail of the showcase and the door. More specifically, the present invention relates to a showcase side door rail having a gasket formed integrally with an inner surface of the side door rail and being deformed to seal a gap between the side door rail and the door under pressure when the door is closed.;The showcase side door rail having a gasket of the present invention includes a support projecting from the center portion of the inner contact surface of the side door rail in contact with the front end of the door, and a pair separated from the end of the support inclined toward the side of the side door rail. The contact surface is characterized in that it is configured integrally.
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