A rubber composition comprising: a rubber component containing a natural rubber and at least one butadiene-based rubber selected from the group consisting of a polybutadiene rubber and a styrene butadiene rubber, the natural rubber being contained in an amount of 30% by mass or more; a filler; 30 to 55 parts by mass of a softening agent relative to 100 parts by mass of the rubber component; and 1 to 6 parts by mass of a linear polyhydric alcohol relative to 100 parts by mass of the rubber component, wherein the softening agent contains a softening agent in an amount of 0 parts by mass or more and less than 15 parts by mass relative to 100 parts by mass of the rubber component and contains a softening agent in an amount of 10 parts by mass or more relative to 100 parts by mass of the rubber component, an SP value (solubility parameter) difference (I SP1-SP2 |) which is the difference between an SP value of the natural rubber and an SP value of the softening agent is 0.30 (cal/cm 3) 1/2 or less, an SP value difference (|SP1-SP3|) which is a difference between the SP value of the natural rubber and an SP value of the softening agent is more than 0.30 (cal/cm 3) 1/2, and the SP values of the natural rubber the softening agent and the softening agent are calculated according to the Fedors method, and wherein a polyhydric alcohol is an alcohol having three or more hydroxy groups in one molecule. a rubber component containing a natural rubber and at least one butadiene-based rubber selected from the group consisting of a polybutadiene rubber and a styrene butadiene rubber, the natural rubber being contained in an amount of 30% by mass or more; a filler; 30 to 55 parts by mass of a softening agent relative to 100 parts by mass of the rubber component; and 1 to 6 parts by mass of a linear polyhydric alcohol relative to 100 parts by mass of the rubber component, wherein the softening agent contains a softening agent in an amount of 0 parts by mass or more and less than 15 parts by mass relative to 100 parts by mass of the rubber component and contains a softening agent in an amount of 10 parts by mass or more relative to 100 parts by mass of the rubber component, an SP value (solubility parameter) difference (I SP1-SP2 |) which is the difference between an SP value of the natural rubber and an SP value of the softening agent is 0.30 (cal/cm 3) 1/2 or less, an SP value difference (|SP1-SP3|) which is a difference between the SP value of the natural rubber and an SP value of the softening agent is more than 0.30 (cal/cm 3) 1/2, and the SP values of the natural rubber the softening agent and the softening agent are calculated according to the Fedors method, and wherein a polyhydric alcohol is an alcohol having three or more hydroxy groups in one molecule. 30 to 55 parts by mass of a softening agent relative to 100 parts by mass of the rubber component; and 1 to 6 parts by mass of a linear polyhydric alcohol relative to 100 parts by mass of the rubber component, wherein the softening agent contains a softening agent in an amount of 0 parts by mass or more and less than 15 parts by mass relative to 100 parts by mass of the rubber component and contains a softening agent in an amount of 10 parts by mass or more relative to 100 parts by mass of the rubber component, an SP value (solubility parameter) difference (I SP1-SP2 |) which is the difference between an SP value of the natural rubber and an SP value of the softening agent is 0.30 (cal/cm 3) 1/2 or less, an SP value difference (|SP1-SP3|) which is a difference between the SP value of the natural rubber and an SP value of the softening agent is more than 0.30 (cal/cm 3) 1/2, and the SP values of the natural rubber the softening agent and the softening agent are calculated according to the Fedors method, and wherein a polyhydric alcohol is an alcohol having three or more hydroxy groups in one molecule.