A method for producing a rubber composition that can improve wet grip performance is provided. The rubber composition includes 100 parts by mass of a rubber component, from 20 to 150 parts by mass of silica, and from 1 to 10 parts by mass of a polymer gel as crosslinked diene polymer particles, wherein from 30 to 90 parts by mass of at least one modified diene rubber selected from the group consisting of a styrene-butadiene rubber, a butadiene rubber and a natural rubber, each haying introduced therein a functional group having an interaction with the silica, and from 70 to 10 parts by mass of an unmodified dine rubber are used as 100 parts by mass of the rubber component, and a polymer gel having a functional group which has an interaction with a functional group of the modified diene rubber is used as the polymer gel.