Rubber composition and tire

A rubber composition comprising, per 100 parts by mass of a rubber component (A) containing 50 parts by mass or more of a diene rubber,

• a polyolefin (B) in an amount of from 1 to 200 parts by mass, the polyolefin (B) having a melting point of 110° C. or higher and 155° C. or lower and a melt mass flow rate (MFR), measured at a temperature of 230° C. under a load of 2.16 kg, of more than 6 g/10 min, or a melt mass flow rate (MFR), measured at a temperature of 190° C. under a load of 2.16 kg, of 10 g/10 min or more.

A method for producing a rubber composition, the method comprising:

• blending, per 100 parts by mass of a rubber component (A) containing 50 parts by mass or more of a diene rubber, a polyolefin (B) in an amount of from 1 to 200 parts by mass, the polyolefin (B) having a melting point of 110° C. or higher and 155° C. or lower and a melt mass flow rate (MFR), measured at a temperature of 230° C. under a load of 2.16 kg, of more than 6 g/10 min, or a melt mass flow rate (MFR), measured at a temperature of 190° C. under a load of 2.16 kg, of 10 g/10 min or more;
• and
• kneading an obtained blend under a condition of a temperature equal to or higher than a melting point of the polyolefin (B).