A sealing assembly for sealing a gap between a swing door and a floor comprises a sealing member installed to be able to rotate from a closed position to an open position, an elastically deforming member made of an elastomer composition engaged to the sealing member, and a seal driving member to rotate the sealing member from the closed position to the open position when the door is opened. The elastically deforming member is deformed when the sealing member rotates from the closed position to the open position, and the sealing member returns from the open position to the closed position by elastic force of the elastically deforming member when the door is closed.