a housing including a first housing and a second housing, wherein the first housing is configured to move relative to the second housing;

a flexible display, wherein an area of the flexible display exposed to an outside of the electronic device is configured to change, between a contracted state and an expanded state, according movement of the first housing;

a multi-bar plate configured to support at least a portion of the flexible display;

a link assembly disposed in an inner space of the housing to support at least a portion of the multi-bar plate and including a first arm and a second arm, wherein the second arm is rotatably coupled to the first arm and is rotatably coupled to a portion of the first housing, wherein the link assembly includes a plurality of rotating axes; and

a rotation detection sensor disposed on a position corresponding to one of the plurality of rotating axes, and configured to detect a degree of rotation while the first arm rotates about one of the plurality of rotating axes and the second arm rotates about one of the plurality of rotating axes.