An electronic device including a flexible display having a first region and a second region; a first frame supporting the first region and rotatable about a first axis; a second frame supporting the second region and rotatable about a second axis different than the first axis; and a hinge module connecting the first frame and the second frame and including a gear mechanism so the first frame rotatable about the first axis and the second frame rotatable about the second axis rotate in conjunction and synchronization with each other when the electronic device is folded and unfolded.