According to various embodiments, an electronic device may include: a first housing, a second housing foldably connected to the first housing through a hinge, and a flexible display supported by the first housing and the second housing, the flexible display including a window layer having a first surface and a second surface facing a direction opposite to the first surface, and including a glass layer, and a display panel corresponding to the second surface under the window layer, wherein the glass layer includes a plurality of first patterns on the first surface, a surface of the plurality of first patterns being lower than the first surface, and a plurality of second patterns on the second surface, a surface of the plurality of second patterns being lower than the second surface, and a first etching amount per unit area of the plurality of first patterns and a second etching amount per the unit area of the plurality of second patterns are different.