An electronic device comprising: a front plate facing a first direction configured to be foldable; a plurality of rear plates facing a second direction opposite to the first direction, each of the rear plates being disposed to be separated from each other with respect to a folding area of the electronic device; a display combined with the front plate, the display being configured to be seen through at least a portion of the front plate and to be foldable together with the front plate; a plurality of middle plates (720, 730) disposed between the display and the plurality of rear plates, each of the middle plates (720, 730) respectively comprising a portion for mounting at least one electronic component and being disposed to be separated from each other with respect to the folding area of the electronic device; a support layer supporting the display and comprising a first part and a second part separated from each other with respect to the folding area of the electronic device, wherein a first part of the support layer is disposed between a first middle plate of the plurality of middle plates (720, 730) and the display, and a second part of the support layer is disposed between a second middle plate of the plurality of middle plates (720, 730) and the display; and a buffer layer comprising a first part and a second part separated from each other with respect to the folding area of the electronic device, wherein a first part of the buffer layer is coupled to the first part of the support layer between the first part of the support layer and the first middle plate of the plurality of middle plates (720, 730), and a second part of the buffer layer is coupled to the second part of the support layer between the second part of the support layer and the second middle plate of the plurality of middle plates (720, 730). a front plate facing a first direction configured to be foldable; a plurality of rear plates facing a second direction opposite to the first direction, each of the rear plates being disposed to be separated from each other with respect to a folding area of the electronic device; a display combined with the front plate, the display being configured to be seen through at least a portion of the front plate and to be foldable together with the front plate; a plurality of middle plates (720, 730) disposed between the display and the plurality of rear plates, each of the middle plates (720, 730) respectively comprising a portion for mounting at least one electronic component and being disposed to be separated from each other with respect to the folding area of the electronic device; a support layer supporting the display and comprising a first part and a second part separated from each other with respect to the folding area of the electronic device, wherein a first part of the support layer is disposed between a first middle plate of the plurality of middle plates (720, 730) and the display, and a second part of the support layer is disposed between a second middle plate of the plurality of middle plates (720, 730) and the display; and a buffer layer comprising a first part and a second part separated from each other with respect to the folding area of the electronic device, wherein a first part of the buffer layer is coupled to the first part of the support layer between the first part of the support layer and the first middle plate of the plurality of middle plates (720, 730), and a second part of the buffer layer is coupled to the second part of the support layer between the second part of the support layer and the second middle plate of the plurality of middle plates (720, 730).