A container stopper, and a manufacturing method therefor, capable of reliably preventing adverse influences of various smells entering from outside the container and absorption and adsorption of the flavor of the contents, as well as preventing adverse influences of a core such as cork. The container stopper comprising a core formed of an elastic material and having a liquid-contact surface and an outer peripheral surface continuous with the liquid-contact surface coated with a skin made of a synthetic resin, and the manufacturing method therefor. In the container stopper, the skin is made of a polyester resin or a synthetic resin having a polyester resin as a main component thereof, and the skin is bonded to the liquid-contact surface and the outer peripheral surface of the core through a bonding layer.