A rubber composition, comprising a rubber component, silica, and a compound represented by formula below, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula below, at least one terminal of the polymer being modified with at least one compound selected from the group consisting of a compound represented by formula below, a compound containing a group represented by formula below, a compound represented by formula below, a silicon compound containing at least one of a group represented by formula below and a group represented by formula below, and a compound containing a group represented by formula below, and an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component, wherein X 1, X 2, and X 3 each independently represent a group represented by formula (Ia) below, a hydroxy group, a hydrocarbyl group, or a substituted hydrocarbyl group, and at least one of X 1, X 2, and X 3 is a hydroxy group or a group represented by the following formula (Ia): wherein R 1 and R 2 each independently represent a C 1-6 hydrocarbyl group, a C 1-6 substituted hydrocarbyl group, a silyl group, or a substituted silyl group, and R 1 and R 2 may be bonded to each other to form a cyclic structure together with the nitrogen atom; wherein n represents an integer of 1 to 10; R 11, R 12, and R 13 each independently represent a C 1-4 hydrocarbyl group or a C 1-4 hydrocarbyloxy group, and at least one of R 11, R 12, and R 13 is the hydrocarbyloxy group; and A 1 represents a nitrogen atom-bearing functional group; wherein p represents an integer of 0 or 1; T represents a C 1-20 hydrocarbylene group or a C 1-20 substituted hydrocarbylene group; and A 2 represents a nitrogen atom-bearing functional group; wherein g represents an integer of 1 to 10; R 21 represents a hydrogen atom, a C 1-6 hydrocarbyl group, or a C 1-6 substituted hydrocarbyl group; A 3 represents an oxygen atom or the following group: -NR 22 - where R 22 represents a hydrogen atom or a C 1-10 hydrocarbyl group; and A 4 represents a functional group bearing at least one of a nitrogen atom and an oxygen atom; wherein w represents an integer of 1 to 11, and A 5 represents a nitrogen atom-bearing functional group; wherein R 101 represents a hydrogen atom, a branched or unbranched C 1-30 alkyl group, a branched or unbranched C 2-30 alkenyl group, a branched or unbranched C 6-30 aryl group, or a hydroxy group; R 102 and R 103 are the same as or different from each other and each represent a hydrogen atom, a branched or unbranched C 1-30 alkyl group, a branched or unbranched C 2-30 alkenyl group, a branched or unbranched C 2-30 alkynyl group, a branched or unbranched C 6-30 aryl group, or a group represented by formula below, wherein a hydrogen atom of the alkyl group, alkenyl group, alkynyl group, or aryl group may be substituted by a hydroxy group or a carboxyl group; a pair of R 101 and R 102, a pair of R 101 and R 103, or a pair of R 102 and R 103 may form a cyclic structure; and d 1 represents an integer of 0 to 8, wherein R 104 represents a branched or unbranched C 1-30 alkylene group; R 105 represents a hydrogen atom, a branched or unbranched C 1-30 alkyl group, a branched or unbranched C 2-30 alkenyl group, a branched or unbranched C 6-30 aryl group, or a hydroxy group; and d 2 represents an integer of 0 to 10.