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; and an acid-modified styrene copolymer, wherein when a total content of the ethylene/unsaturated ester copolymer and the acid-modified styrene copolymer in the sealing resin composition is 100% by mass, a content of the ethylene/unsaturated ester copolymer 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 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 and the acid-modified styrene copolymer is 60% by mass or more, a content of a tackifier resin 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 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; and an acid-modified styrene copolymer, wherein when a total content of the ethylene/unsaturated ester copolymer and the acid-modified styrene copolymer in the sealing resin composition is 100% by mass, a content of the ethylene/unsaturated ester copolymer 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 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 and the acid-modified styrene copolymer is 60% by mass or more, a content of a tackifier resin 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 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; and an acid-modified styrene copolymer, wherein when a total content of the ethylene/unsaturated ester copolymer and the acid-modified styrene copolymer in the sealing resin composition is 100% by mass, a content of the ethylene/unsaturated ester copolymer 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 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 and the acid-modified styrene copolymer is 60% by mass or more, a content of a tackifier resin 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 is at least one selected from the hydrogen additive of the alicyclic hydrocarbon resin and the hydrogen additive of the aromatic hydrocarbon resin.