An electronic device is be provided. The electronic device includes a first housing, a second housing configured to slidably move relative to the first housing, a rollable display configured to be unrolled or rolled based on a slide movement of the second housing, a multi-bar structure supporting the rollable display, and attached to at least a portion of the rollable display, and a guide assembly configured to guide the slide movement of the second housing, wherein the guide assembly includes a rail structure connected to the second housing, and a rail receiving part including a first surface, in which a first slit receiving at least a portion of the multi-bar structure is formed, and a second surface opposite to the first surface and receiving at least a portion of the rail structure, and wherein the rail structure is configured to slide with respect to the rail receiving portion.