Although the thickness of the inner glass plate 12 can be made equal to that of the outer glass plate 11, the thickness of the inner glass plate 12 can be made smaller than that of the outer glass plate 11 in order to reduce the weight of the laminated glass 10, for example. Specifically, when glass strength is taken into consideration, the thickness is preferably 0.6 to 2.0 mm, more preferably 0.8 to 1.6 mm, and particularly preferably 1.0 to 1.4 mm. Furthermore, the thickness is preferably 0.8 to 1.3 mm. With regard to the inner glass plate 12 as well, the thickness to be used can be determined in accordance with the application of the glass plate.

Here, an example of a method of measuring the thickness of a curved glass plate (laminated glass) 1 will be described. First, with respect to the measurement position, the measurement is performed at two positions: an upper position and a lower position on a center line S extending vertically through the center of a glass plate in the horizontal direction. Although there is no particular limitation on the measuring apparatus, a thickness gauge such as SM-112 manufactured by TECLOCK Corporation can be used, for example. During measurement, the glass plate is disposed such that the curved surface of the glass plate is placed on a flat surface, and an end portion of the glass plate is sandwiched by and measured with the thickness gauge. Note that a flat glass plate can also be measured in the same manner as a curved glass plate.

1-2. Interlayer