This invention is a rubber stopper for medical treatment, which is obtained by molding a resin composition containing a component (A): at least one of a block copolymer having at least two of a polymer block P containing a vinyl aromatic compound as the core and at least one of a polymer block Q containing a conjugated diene as the core and a hydrogenated block copolymer thereof, a component (B): a hydrocarbon-based softening agent for rubbers, and a component (C): a polyolefin-based resin, wherein the resin composition contains a specified amount of the component (C) based on the total amount of the component (A) and the component (B), and the resin composition has a specified molecular weight distribution.
