A flexible display device comprising: a protection member forming a first outer surface (OS-L) exposed to an outside of the flexible display device; a window member forming a second outer surface (OS-U) exposed to the outside; a display member disposed between the protection member and the window member; a first adhesion member to couple the display member to the protection member; and a second adhesion member to couple the display member to the window member, wherein the display member comprises: a display panel layer (DP, DP-R) forming a first display panel surface (BS1-L) and a second display panel surface (BS1-U), the display panel layer (DP, DP-R) comprising: a display area comprising a plurality of light emitting areas (PXA-R, PXA-G, PXA-B) and a non-light emitting area (NPXA) adjacent to the plurality of the light emitting areas (PXA-R, PXA-G, PXA-B); and a non-display area adjacent to the display area; a touch sensing layer (TS, TS-R) forming a first base surface; and a reflection prevention layer forming a second base surface, characterized in that: the display panel layer, the touch sensing layer and the reflection prevention layer are integrated with each other by a continuous process; the touch sensing layer (TS, TS-R) is disposed directly on one of the first display panel surface (BS1-L), the second display panel surface (BS1-U), and the second base surface; the reflection prevention layer is disposed directly on the second display panel surface (BS1-U) or the first base surface; and a thickness of the display member is less than a sum of thicknesses of the protection member and the window member. a protection member forming a first outer surface (OS-L) exposed to an outside of the flexible display device; a window member forming a second outer surface (OS-U) exposed to the outside; a display member disposed between the protection member and the window member; a first adhesion member to couple the display member to the protection member; and a second adhesion member to couple the display member to the window member, wherein the display member comprises: a display panel layer (DP, DP-R) forming a first display panel surface (BS1-L) and a second display panel surface (BS1-U), the display panel layer (DP, DP-R) comprising: a display area comprising a plurality of light emitting areas (PXA-R, PXA-G, PXA-B) and a non-light emitting area (NPXA) adjacent to the plurality of the light emitting areas (PXA-R, PXA-G, PXA-B); and a non-display area adjacent to the display area; a touch sensing layer (TS, TS-R) forming a first base surface; and a reflection prevention layer forming a second base surface, a display panel layer (DP, DP-R) forming a first display panel surface (BS1-L) and a second display panel surface (BS1-U), the display panel layer (DP, DP-R) comprising: a display area comprising a plurality of light emitting areas (PXA-R, PXA-G, PXA-B) and a non-light emitting area (NPXA) adjacent to the plurality of the light emitting areas (PXA-R, PXA-G, PXA-B); and a non-display area adjacent to the display area; a display area comprising a plurality of light emitting areas (PXA-R, PXA-G, PXA-B) and a non-light emitting area (NPXA) adjacent to the plurality of the light emitting areas (PXA-R, PXA-G, PXA-B); and a non-display area adjacent to the display area; a touch sensing layer (TS, TS-R) forming a first base surface; and a reflection prevention layer forming a second base surface, characterized in that: the display panel layer, the touch sensing layer and the reflection prevention layer are integrated with each other by a continuous process; the touch sensing layer (TS, TS-R) is disposed directly on one of the first display panel surface (BS1-L), the second display panel surface (BS1-U), and the second base surface; the reflection prevention layer is disposed directly on the second display panel surface (BS1-U) or the first base surface; and a thickness of the display member is less than a sum of thicknesses of the protection member and the window member. the display panel layer, the touch sensing layer and the reflection prevention layer are integrated with each other by a continuous process; the touch sensing layer (TS, TS-R) is disposed directly on one of the first display panel surface (BS1-L), the second display panel surface (BS1-U), and the second base surface; the reflection prevention layer is disposed directly on the second display panel surface (BS1-U) or the first base surface; and a thickness of the display member is less than a sum of thicknesses of the protection member and the window member.