A rubber stopper for a medicine container has a rubber stopper body and a coating layer directly applied to a surface exposed in the medicine container. The coating layer is more flexible than a forming material of the rubber stopper body. The said coating layer comprises a composition containing a silicone-based resin which comprises a condensate of a reactive silicone having a terminal silanol group, and wherein the condensate contains a siloxane bond derived from the silanol group.
