A foldable electronic device comprising: a first housing; a second housing; a hinge module disposed between the first housing and the second housing and configured to enable the foldable electronic device to be folded; a flexible display panel disposed over the first housing, the second housing and the hinge module; a plate positioned under the flexible display panel to support the flexible display panel, wherein the plate comprises: a first flat portion disposed with respect to the first housing, a second flat portion disposed with respect to the second housing, and a flexible portion formed between the first flat portion and the second flat portion, the flexible portion including a plurality of openings spaced apart from each other so as to enable the flexible portion to bend when the foldable electronic device is folded; a blocking member positioned under the flexible portion of the plate such that the blocking member covers the plurality of openings of the flexible portion of the plate; a first reinforcing member positioned at least partially under a first portion of the flexible portion, wherein a first portion of the blocking member is positioned between the first reinforcing member and the flexible portion of the plate; and a second reinforcing member positioned at least partially under a second portion of the flexible portion, wherein a second portion of the blocking member is positioned between the second reinforcing member and the flexible portion of the plate, wherein the first reinforcing member is spaced apart from the second reinforcing member, wherein each of the first reinforcing member and the second reinforcing member is adhesively attached to a portion of the plate except for at least a portion of the flexible portion of the plate covered by the blocking member, and wherein the plate further comprises at least one support piece (4501, 4502) protruded, along an edge of the plate, further than an edge of the flexible display panel. a first housing; a second housing; a hinge module disposed between the first housing and the second housing and configured to enable the foldable electronic device to be folded; a flexible display panel disposed over the first housing, the second housing and the hinge module; a plate positioned under the flexible display panel to support the flexible display panel, wherein the plate comprises: a first flat portion disposed with respect to the first housing, a second flat portion disposed with respect to the second housing, and a flexible portion formed between the first flat portion and the second flat portion, the flexible portion including a plurality of openings spaced apart from each other so as to enable the flexible portion to bend when the foldable electronic device is folded; a first flat portion disposed with respect to the first housing, a second flat portion disposed with respect to the second housing, and a flexible portion formed between the first flat portion and the second flat portion, the flexible portion including a plurality of openings spaced apart from each other so as to enable the flexible portion to bend when the foldable electronic device is folded; a blocking member positioned under the flexible portion of the plate such that the blocking member covers the plurality of openings of the flexible portion of the plate; a first reinforcing member positioned at least partially under a first portion of the flexible portion, wherein a first portion of the blocking member is positioned between the first reinforcing member and the flexible portion of the plate; and a second reinforcing member positioned at least partially under a second portion of the flexible portion, wherein a second portion of the blocking member is positioned between the second reinforcing member and the flexible portion of the plate, wherein the first reinforcing member is spaced apart from the second reinforcing member, wherein each of the first reinforcing member and the second reinforcing member is adhesively attached to a portion of the plate except for at least a portion of the flexible portion of the plate covered by the blocking member, and wherein the plate further comprises at least one support piece (4501, 4502) protruded, along an edge of the plate, further than an edge of the flexible display panel.