Provided are a rubber composition in which a component having a vulcanization scorching property which has so far exerted an adverse effect is reduced to display the physical properties of a natural rubber at maximum and in which blended is a rubber component-containing coagulated matter containing a serum (serum component) of the natural rubber which is a useful component such as an aging resistant component which has not so far been introduced into a natural rubber and a production process for the above rubber component-containing coagulated matter. The rubber composition blended with the rubber component-containing coagulated matter includes a rubber composition, wherein a rubber component is blended, and the rubber component comprises a component (A) comprising at least one of a natural rubber and a diene base synthetic rubber and a component (B) comprising a rubber component-containing coagulated matter obtained by drying and coagulating a serum of natural rubber obtained by centrifugally separating a natural rubber latex.