Rubber composition for base tread and tire

A rubber composition for base tread, which is a rubber composition for base tread to be used for base tread of a tread portion of a tire,

• wherein the rubber composition for base tread contains a rubber component containing 70% by mass or more of natural rubber, a filler, sulfur, and a resin being at least one of a C5-based resin, a C5 to C9-based resin, a C9-based resin, and a hydrogenated product thereof,
• wherein a ratio of storage modulus at 0° C., expressed as 0° C. E′, to storage modulus at 30° C., expressed as 30° C. E′, that is, 0° C. E′/30° C. E′ is in a range of 1.3 to 2.0,
• wherein the tan ° C. at 30° C. (30° C. tan δ) is 0.2 or less,
• wherein a content of the resin is 20 parts by mass to 40 parts by mass with respect to 100 parts by mass of the rubber component,
• wherein a content of the sulfur is 4 parts by mass to 10 parts by mass with respect to 100 parts by mass of the rubber component,
• wherein the filler contains carbon black and a content of the carbon black is 25 parts by mass to 65 parts by mass with respect to 100 parts by mass of the rubber component, and
• wherein the rubber component further contains styrene butadiene rubber and/or butadiene rubber in addition to the natural rubber and a total content of the styrene butadiene rubber and/or the butadiene rubber in the rubber component is 5 mass % to 30 mass %.