To improve not only the mold releasability between a bladder and a tyre, but also the durability of the bladder, and prevent the corrosion of piping installation by using a releaser containing a sulfur trapping agent.

A releaser for rubber vulcanization is for applying to the surface of a raw tyre at a step prior to a vulcanization step in manufacturing tyres, and a sulfur trapping agent is contained in at least one kinds of releaser. This sulfur trapping agent is contained to prevent the migration of sulfur from the side of a tyre inner liner to the side of a bladder without deteriorating the mold releasability of the mold releasing component, and improve the mold releasability between the bladder and a tyre and the durability of the bladder. At least one kind of zinc oxide, calcium oxide and sodium oxide may be used as the sulfur trapping agent, but zin oxide may be most preperable in the point of cost and effect.