A lid material comprising: a base layer, a seal layer formed of the sealing material formed of a sealing resin composition provided on one surface of the base layer, wherein the sealing resin composition comprising: an ethylene/unsaturated ester copolymer (A); and an acid-modified styrene copolymer (B), wherein when a total content of the ethylene/unsaturated ester copolymer (A) and the acid-modified styrene copolymer (B) in the sealing resin composition is 100% by mass, a content of the ethylene/unsaturated ester copolymer (A) is equal to or more than 60% by mass and equal to or less than 99% by mass, a content of the acid-modified styrene copolymer (B) is equal to or more than 1% by mass and equal to or less than 40% by mass, wherein when the total of the sealing resin composition is 100% by mass, the total content of the ethylene/unsaturated ester copolymer (A) and the acid-modified styrene copolymer (B) is 60% by mass or more, a content of a tackifier resin (C) in the sealing resin composition is less than 3% by mass when a total of the sealing resin composition is 100% by mass; and wherein the tackifier resin (C) is at least one selected from the hydrogen additive of the alicyclic hydrocarbon resin and the hydrogen additive of the aromatic hydrocarbon resin. a base layer, a seal layer formed of the sealing material formed of a sealing resin composition provided on one surface of the base layer, wherein the sealing resin composition comprising: an ethylene/unsaturated ester copolymer (A); and an acid-modified styrene copolymer (B), wherein when a total content of the ethylene/unsaturated ester copolymer (A) and the acid-modified styrene copolymer (B) in the sealing resin composition is 100% by mass, a content of the ethylene/unsaturated ester copolymer (A) is equal to or more than 60% by mass and equal to or less than 99% by mass, a content of the acid-modified styrene copolymer (B) is equal to or more than 1% by mass and equal to or less than 40% by mass, wherein when the total of the sealing resin composition is 100% by mass, the total content of the ethylene/unsaturated ester copolymer (A) and the acid-modified styrene copolymer (B) is 60% by mass or more, a content of a tackifier resin (C) in the sealing resin composition is less than 3% by mass when a total of the sealing resin composition is 100% by mass; and wherein the tackifier resin (C) is at least one selected from the hydrogen additive of the alicyclic hydrocarbon resin and the hydrogen additive of the aromatic hydrocarbon resin. an ethylene/unsaturated ester copolymer (A); and an acid-modified styrene copolymer (B), wherein when a total content of the ethylene/unsaturated ester copolymer (A) and the acid-modified styrene copolymer (B) in the sealing resin composition is 100% by mass, a content of the ethylene/unsaturated ester copolymer (A) is equal to or more than 60% by mass and equal to or less than 99% by mass, a content of the acid-modified styrene copolymer (B) is equal to or more than 1% by mass and equal to or less than 40% by mass, wherein when the total of the sealing resin composition is 100% by mass, the total content of the ethylene/unsaturated ester copolymer (A) and the acid-modified styrene copolymer (B) is 60% by mass or more, a content of a tackifier resin (C) in the sealing resin composition is less than 3% by mass when a total of the sealing resin composition is 100% by mass; and wherein the tackifier resin (C) is at least one selected from the hydrogen additive of the alicyclic hydrocarbon resin and the hydrogen additive of the aromatic hydrocarbon resin. <EOS>