Two vulcanizates are adhered to each other by (I) applying a particular rubber cement composition based on natural rubber or isoprene rubber and including sulfur or an organic sulfur compound, an ultrarapid accelerator, an organic amine and carbon black, to surfaces of the vulcanizates to be adhered followed by drying; and (II) sandwiching an unvulcanized rubber sheet of a particular cushion rubber composition based on natural rubber or isoprene rubber and including sulfur, an organic amine and carbon black, between the applied surfaces of the vulcanizates and vulcanizing them at a temperature of 0-100 DEG C under pressure.
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