To provide rubber compositions which can improve ozone crack preventive performance over the entire temperature range of from low temperatures to high temperatures and does not cause discoloration of products to white.

Rubber compositions comprise 100 pts.wt. rubber; 0.5-10 pts.wt. petroleum wax having a two-peak carbon atom number distribution of a low molecular weight component region and a high molecular weight component region with a carbon number of the peak-containing component of 24-29 and a non-normal paraffin content of 10-15 wt.% in the low molecular weight region and with a carbon number of the peak-containing component of 32-38 and a non-normal paraffin content of 18-25 wt.% in the high molecular weight region; and 1-10 pts.wt. olefin resin.