Method for producing rubber composition, and rubber composition

A method for producing a rubber composition that includes a rubber component (A) including natural rubber, at least one filler (B) selected from an inorganic filler and carbon black, and a monohydrazide compound (C) supported on a solid, the method comprising:

• compounding in an optional preliminary compounding stage and a plurality of compounding stages,
• adding the monohydrazide compound (C) supported on the solid to the rubber component (A) and kneading them in the preliminary compounding stage and/or a first compounding stage, and
• adding the filler (B) to the rubber component (A) and kneading them in the first compounding stage,
• the monohydrazide compound (C) being represented by general formula (I):
• R—CONHNH2 (I)
• where R represents an alkyl group having from 1 to 30 carbon atoms, a cycloalkyl group having from 3 to 30 carbon atoms, or an aryl group, and
• the solid is one or more selected from the group consisting of silica, aluminum hydroxide, clay, calcium carbonate, talc, carbon black, stearic acid, waxes, and anti-aging agents.