The present invention provides rubber compositions having an excellent transparency and rubber properties comprising a rubbery polymer and an inorganic filler, and relates to specific methods of producing said rubber. Thus, they are rubber compositions comprising 100 parts by weight of at least one rubbery polymer and 5 150 parts by weight of an inorganic filler per 100 parts by weight of said rubbery polymer, wherein the haze is 50% or less, and the inorganic bulking agents are dispersed so that the number of circular regions with a diameter of 0.5 .mu.m or greater having no inorganic fillers is one or less and the number of circular regions with a diameter of 0.3 .mu.m or greater having no inorganic fillers is three or less in an image of a 5 .mu.m square of said rubber composition determined by a scanning probe microscope (SPM) and wherein the haze of said rubber composition having a thickness of 5 mm is 50% or less, and specific methods of producing them.