RUBBER COMPOSITION

The present invention relates to: a rubber composition which has excellent grip; a method for producing this rubber composition; a shoe sole which uses this rubber composition; a shoe; a tire; and a method for improving the frictional force of a rubber component.　(1) A rubber composition which contains (A) a rubber component， (B) a lignin degradation product and (C) a specific amine compound; (2) A rubber composition which is obtained by blending (A) a rubber component， (B) lignin and (C) a specific amine compound; (3) a shoe sole which uses the rubber composition; (4) a shoe which comprises the shoe sole; (5) a tire which uses the rubber composition; (6) a method for producing a rubber composition， wherein (A) a rubber component， (B) lignin and (C) a specific amine compound are blended and vulcanized; and (7) a method for improving the frictional force of a rubber component， wherein (B) lignin and (C) a specific amine compound are blended into (A) a rubber component.