A display panel comprising: a first panel area having a first front face (1 10a) and a first rear face (1 10b); a second panel area having a second front face and a second rear face, wherein when the display panel is in a folded state at a boundary between the first and second panel areas (110, 120), the second panel area confronts the first panel area such that the second rear face faces the first rear face; a third panel area having a third front face and a third rear face, wherein when the display panel is in the folded state at a boundary between the second and third panel areas (120, 130), the third panel area confronts the second panel area such that the third front face faces the second front face; a first hinge coupling portion for coupling one end of the first panel area and one end of the second panel area to each other in a hinge coupling manner; and a second hinge coupling portion for coupling another end of the second panel area that is opposite to the one end of the second panel area, and one end of the third panel area to each other in the hinge coupling manner, wherein the first panel area, the second panel area, and the third panel area are continuously arranged and are integrally formed with each other; characterized by further comprising: an outer body extending from another end of the third panel area that is opposite to the one end of the third panel area, and having a width equal to a width of the third panel area, and having a thickness and a vertical dimension greater than a thickness and a vertical dimension of the third panel area, wherein the outer body has a shape formed so as to face and surround the one end of the first panel area, the one end of the second panel area, and the first hinge coupling portion when all of the first panel area, the second panel area, and the third panel area are in the folded state relative to each other; and a transparent cover accommodated in an accommodation space of the outer body and configured to protrude from a cover-receiving hole formed in the outer body so as to cover the first front face of the first panel area when the first panel area, the second panel area, and the third panel area are in the folded state. a first panel area having a first front face (1 10a) and a first rear face (1 10b); a second panel area having a second front face and a second rear face, wherein when the display panel is in a folded state at a boundary between the first and second panel areas (110, 120), the second panel area confronts the first panel area such that the second rear face faces the first rear face; a third panel area having a third front face and a third rear face, wherein when the display panel is in the folded state at a boundary between the second and third panel areas (120, 130), the third panel area confronts the second panel area such that the third front face faces the second front face; a first hinge coupling portion for coupling one end of the first panel area and one end of the second panel area to each other in a hinge coupling manner; and a second hinge coupling portion for coupling another end of the second panel area that is opposite to the one end of the second panel area, and one end of the third panel area to each other in the hinge coupling manner, wherein the first panel area, the second panel area, and the third panel area are continuously arranged and are integrally formed with each other; characterized by further comprising: an outer body extending from another end of the third panel area that is opposite to the one end of the third panel area, and having a width equal to a width of the third panel area, and having a thickness and a vertical dimension greater than a thickness and a vertical dimension of the third panel area, wherein the outer body has a shape formed so as to face and surround the one end of the first panel area, the one end of the second panel area, and the first hinge coupling portion when all of the first panel area, the second panel area, and the third panel area are in the folded state relative to each other; and a transparent cover accommodated in an accommodation space of the outer body and configured to protrude from a cover-receiving hole formed in the outer body so as to cover the first front face of the first panel area when the first panel area, the second panel area, and the third panel area are in the folded state. an outer body extending from another end of the third panel area that is opposite to the one end of the third panel area, and having a width equal to a width of the third panel area, and having a thickness and a vertical dimension greater than a thickness and a vertical dimension of the third panel area, wherein the outer body has a shape formed so as to face and surround the one end of the first panel area, the one end of the second panel area, and the first hinge coupling portion when all of the first panel area, the second panel area, and the third panel area are in the folded state relative to each other; and a transparent cover accommodated in an accommodation space of the outer body and configured to protrude from a cover-receiving hole formed in the outer body so as to cover the first front face of the first panel area when the first panel area, the second panel area, and the third panel area are in the folded state.