Disclosed is a gas barrier laminate film comprising a base material film and at least one gas barrier layer obtained by a sol-gel method, wherein a difference between oxygen transmission rate at 25.degree. C. in relative humidity of 10% and oxygen transmission rate at 25.degree. C. in relative humidity of 90% is within the range of 0 to 1.0.times.10.sup.-5 ml/m.sup.2.cndot.day.cndot.Pa. Substrates and image display devices utilizing the gas barrier laminate film show superior gas barrier property even in high humidity, and therefore they show high precision and high durability.