Flexible display device

A flexible display device, comprising:

• a flexible display panel that comprises a folding area in which a folding axis is defined and a peripheral area disposed on opposing sides of the folding area;
• and
• a window member overlapping the folding area and the peripheral area, and comprising a first base layer disposed on a surface of the flexible display panel, a second base layer disposed on the first base layer in a direction in which the first base layer is disposed on the flexible display panel, and a third base layer disposed on the second base layer in a direction in which the second base layer is disposed on the first base layer,
• wherein the first base layer has the lowest modulus of elasticity among the base layers, has a first portion that overlaps the folding area, and has a second portion that overlaps the peripheral area, the first portion of the first base layer is thicker than the second portion of the first base layer,
• wherein the first base layer is continuous within the folding area and the peripheral area,
• wherein the third base layer has the highest modulus of elasticity among the base layers, has a first portion that overlaps the folding area, and has a second portion that overlaps the peripheral area, the first portion of the third layer being thinner than the second portion of the third base layer,
• wherein a border between the first portion of the second base layer and the first portion of the third base layer is planar,
• wherein the window member comprises a transparent material, and
• wherein the first base layer and the second base layer are flat in the peripheral area and have uniform thicknesses in the peripheral area.