An electronic device comprising: a first housing; a second housing; a hinge module rotatably connecting the first housing and the second housing; a flexible display disposed to reach one surface of the second housing from one surface of the first housing across an area in which the hinge module is disposed; and a multi-bar assembly including a plurality of bars (530, 540) disposed between the first housing and the second housing, configured to vary in response to rotational movement of the hinge module, and supporting a bending area of the flexible display, wherein the multi-bar assembly comprises: a first bar and a second bar arranged side by side, each of the first bar and the second bar having at least one guide recess (532a, 542a), the guide recesses (532a, 542a) being disposed at positions corresponding to each other on the first bar and the second bar; a first bar support bracket disposed under the first bar and comprising a first rail forming a curved shape and a first rail guide corresponding to a shape of the first rail; and a second bar support bracket disposed under the second bar and comprising a second rail (6 11b) forming a curved shape and a second rail guide corresponding to a shape of the second rail, the second bar support bracket being coupled to be rotatable and slidable with respect to the first bar support bracket, wherein a shape of the first rail guide corresponds to the curved shape of the second rail and a shape of the second rail guide corresponds to the curved shape of the first rail, and wherein the first rail is configured to perform a sliding movement along the second rail guide of the second support bracket located adjacent thereto in response to folding and unfolding of the electronic device, and at least a portion of the first rail is configured to insert into the guide recess in the second bar through the sliding movement. a first housing; a second housing; a hinge module rotatably connecting the first housing and the second housing; a flexible display disposed to reach one surface of the second housing from one surface of the first housing across an area in which the hinge module is disposed; and a multi-bar assembly including a plurality of bars (530, 540) disposed between the first housing and the second housing, configured to vary in response to rotational movement of the hinge module, and supporting a bending area of the flexible display, wherein the multi-bar assembly comprises: a first bar and a second bar arranged side by side, each of the first bar and the second bar having at least one guide recess (532a, 542a), the guide recesses (532a, 542a) being disposed at positions corresponding to each other on the first bar and the second bar; a first bar support bracket disposed under the first bar and comprising a first rail forming a curved shape and a first rail guide corresponding to a shape of the first rail; and a second bar support bracket disposed under the second bar and comprising a second rail (6 11b) forming a curved shape and a second rail guide corresponding to a shape of the second rail, the second bar support bracket being coupled to be rotatable and slidable with respect to the first bar support bracket, wherein a shape of the first rail guide corresponds to the curved shape of the second rail and a shape of the second rail guide corresponds to the curved shape of the first rail, and wherein the first rail is configured to perform a sliding movement along the second rail guide of the second support bracket located adjacent thereto in response to folding and unfolding of the electronic device, and at least a portion of the first rail is configured to insert into the guide recess in the second bar through the sliding movement. a first bar and a second bar arranged side by side, each of the first bar and the second bar having at least one guide recess (532a, 542a), the guide recesses (532a, 542a) being disposed at positions corresponding to each other on the first bar and the second bar; a first bar support bracket disposed under the first bar and comprising a first rail forming a curved shape and a first rail guide corresponding to a shape of the first rail; and a second bar support bracket disposed under the second bar and comprising a second rail (6 11b) forming a curved shape and a second rail guide corresponding to a shape of the second rail, the second bar support bracket being coupled to be rotatable and slidable with respect to the first bar support bracket, wherein a shape of the first rail guide corresponds to the curved shape of the second rail and a shape of the second rail guide corresponds to the curved shape of the first rail, and wherein the first rail is configured to perform a sliding movement along the second rail guide of the second support bracket located adjacent thereto in response to folding and unfolding of the electronic device, and at least a portion of the first rail is configured to insert into the guide recess in the second bar through the sliding movement.