An electronic device may include a display, a first housing, a second housing, and a hinge assembly configured to connect the first housing to the second housing and operate between a folded state and an unfolded state, wherein the hinge assembly may include a hinge bracket, a slider slidably connected to the hinge bracket and including a pair of reference cams and a pair of rotation rails configured to define a pair of hinge axes, a pair of rotators rotatably connected to the slider with the pair of hinge axes as centers, respectively, and both including a rotation cam configured to interoperate with the reference cams, and an elastic member configured to provide an elastic force in a direction in which the reference cam and the rotation cam press each other.