A foldable electronic device, comprising: a flexible display; a hinge assembly configured to fold a first area of the flexible display and a second area of the flexible display toward each other about a folding portion of the foldable electronic device and to unfold the first area of the flexible display and the second area of the flexible display away from each other about the folding portion of the foldable electronic device, characterized in that the hinge assembly includes: a first hinge frame disposed under at least one portion of the first area of the flexible display and supporting the first area of the flexible display; a second hinge frame disposed under at least one portion of the second area of the flexible display and supporting the second area of the flexible display; a first hinge pivotally connecting a first portion of the first hinge frame and a second portion of the second frame with each other; and a second hinge pivotally connecting a third portion of the first hinge frame and a fourth portion of the second frame with each other; wherein the first hinge and the second hinge are spaced apart from each other by a predetermined distance in a direction of a central axis of the folding portion so as to be disposed at a positions overlapping the folding portion when viewed from above a front face of the foldable electronic device, a heat diffusion member (210, 211, 213) configured to dissipate heat generated from an electronic component included in the foldable electronic device, at least one portion of the heat diffusion member (210, 211, 213) disposed across the central axis of the folding portion between the first hinge and the second hinge; a first bracket including a first recessed seating portion on which the first hinge frame is fixedly seated, a recessed length, width, and height of the first recessed seating portion substantially corresponding to a length, width, and height of the first hinge frame, respectively; and a second bracket including a second recessed seating portion on which the second hinge frame is fixedly seated, a recessed length, width, and height of the second recessed seating portion substantially corresponding to a length, width, and height of the second hinge frame, respectively. a flexible display; a hinge assembly configured to fold a first area of the flexible display and a second area of the flexible display toward each other about a folding portion of the foldable electronic device and to unfold the first area of the flexible display and the second area of the flexible display away from each other about the folding portion of the foldable electronic device, characterized in that the hinge assembly includes: a first hinge frame disposed under at least one portion of the first area of the flexible display and supporting the first area of the flexible display; a second hinge frame disposed under at least one portion of the second area of the flexible display and supporting the second area of the flexible display; a first hinge pivotally connecting a first portion of the first hinge frame and a second portion of the second frame with each other; and a second hinge pivotally connecting a third portion of the first hinge frame and a fourth portion of the second frame with each other; a first hinge frame disposed under at least one portion of the first area of the flexible display and supporting the first area of the flexible display; a second hinge frame disposed under at least one portion of the second area of the flexible display and supporting the second area of the flexible display; a first hinge pivotally connecting a first portion of the first hinge frame and a second portion of the second frame with each other; and a second hinge pivotally connecting a third portion of the first hinge frame and a fourth portion of the second frame with each other; wherein the first hinge and the second hinge are spaced apart from each other by a predetermined distance in a direction of a central axis of the folding portion so as to be disposed at a positions overlapping the folding portion when viewed from above a front face of the foldable electronic device, a heat diffusion member (210, 211, 213) configured to dissipate heat generated from an electronic component included in the foldable electronic device, at least one portion of the heat diffusion member (210, 211, 213) disposed across the central axis of the folding portion between the first hinge and the second hinge; a first bracket including a first recessed seating portion on which the first hinge frame is fixedly seated, a recessed length, width, and height of the first recessed seating portion substantially corresponding to a length, width, and height of the first hinge frame, respectively; and a second bracket including a second recessed seating portion on which the second hinge frame is fixedly seated, a recessed length, width, and height of the second recessed seating portion substantially corresponding to a length, width, and height of the second hinge frame, respectively.