Abstract: A structure of a weatherstrip applicable to a door portion or a trunk lid and a vehicle body is disclosed in which one of grasping lips impinged on a flange portion of an opening edge of the vehicle body so as to grasp the flange portion and sub-lip integrally formed at an end edge of a weatherstrip main body so as to extend toward the outside portion of the vehicle body are seesawed with a linkage portion between the grasping lip and sub-lip as a fulcrum. When the weatherstrip main body is inserted onto the flange portion, a tip portion of the corresponding grasping lip is abutted with the outside surface of the flange portion and is easily pivoted toward the outside of the flange portion with the linkage portion as the fulcrum. When the tip portion of the grasping lip is pivoted toward the outside portion of the flange portion, its reaction force causes the sub-lip to pivot toward the internal direction so that its tip portion is impinged on the end surface of the vehicle body.