A rubber composition for a tire tread comprising: a diene rubber; a silica; a sulfur-containing silane coupling agent; and an alkyl triethoxysilane represented by Formula (I); a content of the silica being from 60 to 200 parts by mass per 100 parts by mass of the diene rubber, the sulfur-containing silane coupling agent being a polysiloxane represented by the following Formula ; a content of the sulfur-containing silane coupling agent being from 1 to 20 mass% relative to the content of the silica, and a content of the alkyl triethoxysilane being from 0.2 to 20 mass% of the content of the silica; (A) a (B) b (C) c (D) d (R 1 ) e SiO (4-2a-b-c-d-e)/2 wherein Formula is an average composition formula, and in Formula , A is a divalent organic group containing a sulfide group represented by formula below: *-(CH 2 ) n -S x -(CH 2 ) n -* wherein, n is an integer from 1 to 10, x is an integer from 1 to 6, and * represents a binding position; B is a monovalent hydrocarbon group selected from the group consisting of hexyl groups, octyl groups, and decyl groups; C is a hydrolyzable group selected from the group consisting of an alkoxy group, a phenoxy group, a carboxyl group, and an alkenyloxy group; D is an organic group containing a mercapto group; R 1 is a monovalent hydrocarbon group having from 1 to 4 carbon atoms; and a to e satisfy the relational expressions 0 ≤ a < 1, 0 < b < 1, 0 < c < 3, 0 < d < 1, 0 ≤ e < 2, and 0 < 2a + b + c + d + e < 4; wherein in Formula (I), R is an alkyl group having from 7 to 20 carbon atoms. a diene rubber; a silica; a sulfur-containing silane coupling agent; and an alkyl triethoxysilane represented by Formula (I); a content of the silica being from 60 to 200 parts by mass per 100 parts by mass of the diene rubber, the sulfur-containing silane coupling agent being a polysiloxane represented by the following Formula ; a content of the sulfur-containing silane coupling agent being from 1 to 20 mass% relative to the content of the silica, and a content of the alkyl triethoxysilane being from 0.2 to 20 mass% of the content of the silica; (A) a (B) b (C) c (D) d (R 1 ) e SiO (4-2a-b-c-d-e)/2 wherein Formula is an average composition formula, and in Formula , A is a divalent organic group containing a sulfide group represented by formula below: *-(CH 2 ) n -S x -(CH 2 ) n -* wherein, n is an integer from 1 to 10, x is an integer from 1 to 6, and * represents a binding position; B is a monovalent hydrocarbon group selected from the group consisting of hexyl groups, octyl groups, and decyl groups; C is a hydrolyzable group selected from the group consisting of an alkoxy group, a phenoxy group, a carboxyl group, and an alkenyloxy group; D is an organic group containing a mercapto group; R 1 is a monovalent hydrocarbon group having from 1 to 4 carbon atoms; and a to e satisfy the relational expressions 0 ≤ a < 1, 0 < b < 1, 0 < c < 3, 0 < d < 1, 0 ≤ e < 2, and 0 < 2a + b + c + d + e < 4; wherein in Formula (I), R is an alkyl group having from 7 to 20 carbon atoms. A is a divalent organic group containing a sulfide group represented by formula below: *-(CH 2 ) n -S x -(CH 2 ) n -* wherein, n is an integer from 1 to 10, x is an integer from 1 to 6, and * represents a binding position; B is a monovalent hydrocarbon group selected from the group consisting of hexyl groups, octyl groups, and decyl groups; C is a hydrolyzable group selected from the group consisting of an alkoxy group, a phenoxy group, a carboxyl group, and an alkenyloxy group; D is an organic group containing a mercapto group; R 1 is a monovalent hydrocarbon group having from 1 to 4 carbon atoms; and a to e satisfy the relational expressions 0 ≤ a < 1, 0 < b < 1, 0 < c < 3, 0 < d < 1, 0 ≤ e < 2, and 0 < 2a + b + c + d + e < 4; wherein in Formula (I), R is an alkyl group having from 7 to 20 carbon atoms. <EOS>