A portable electronic device is provided. The portable electronic device includes a first housing including a first surface and a second surface a second housing including a third surface and a fourth surface, and a hinge. The hinge includes a hinge shaft, a sliding device including a portion configured to slide to an inside or an outside of the second housing to be introduced, or slide from the inside or the outside of the second housing in a specific direction to be extracted in correspondence to a hinge operation of the second housing, and a multi-bar disposed between the first surface and the fourth surface and including multi-bar units to be spread or bent in correspondence to a hinge operation of the second housing.