Various embodiments disclosed in the present disclosure relate to an electronic device comprising a flexible display. According to an embodiment, the electronic device comprises a flexible display, comprising: a housing; and a flexible display comprising a display panel at least a portion of which can bend, and a window comprising the exterior of the display, wherein the window comprises a first portion having a first thickness, and a second portion extending from the first portion in a first direction and having substantially the same thickness as the first portion, and the second portion comprises an edge area having a second thickness thinner than the first thickness, in a second direction perpendicular to the first direction.