Disclosed is a flexible display device. The flexible display device includes a base layer including a first portion in which an organic light emitting diode is disposed on a first surface and a second portion which has a bended section bent toward a second surface which is opposite to the first surface at the outside of the first portion; and conductive lines in the bended section, the conductive lines are disposed on two or more layers, and the conductive lines extend in a direction which is not parallel to a bending direction of the bended section.