A head-mounted display, comprising: a display protection shell having a rear end open toward a rear part of the head-mounted display and a front end configured to attach a display panel assembly, wherein the front end of the display protection shell has at least one corner, and wherein a portion of the display protection shell has a frustum shape; and a metal frame comprising: a front surface, a rear surface at an opposite side of the front surface, the display panel assembly placed between the front end of the display protection shell and the rear surface, and a wall raised from the rear surface, the wall spaced apart from and extending along at least an edge of the display protection shell to protect the display protection shell, wherein the at least one corner of the display protection shell has perpendicular edges, and wherein the wall has a segment angled and conjoined to form a pocket for receiving the at least one corner of the display protection shell, and wherein the wall is spaced apart from and extends between an upper corner to the at least one corner of the display protection shell, wherein the upper corner of the display protection shell is cut out in a diagonal direction, and wherein the wall includes a first segment extending straight along the edge of the display protection shell and a second segment connected to the first segment, the second segment curved relative to the first segment at an angle (α). a display protection shell having a rear end open toward a rear part of the head-mounted display and a front end configured to attach a display panel assembly, wherein the front end of the display protection shell has at least one corner, and wherein a portion of the display protection shell has a frustum shape; and a metal frame comprising: a front surface, a rear surface at an opposite side of the front surface, the display panel assembly placed between the front end of the display protection shell and the rear surface, and a wall raised from the rear surface, the wall spaced apart from and extending along at least an edge of the display protection shell to protect the display protection shell, wherein the at least one corner of the display protection shell has perpendicular edges, and wherein the wall has a segment angled and conjoined to form a pocket for receiving the at least one corner of the display protection shell, and wherein the wall is spaced apart from and extends between an upper corner to the at least one corner of the display protection shell, a front surface, a rear surface at an opposite side of the front surface, the display panel assembly placed between the front end of the display protection shell and the rear surface, and a wall raised from the rear surface, the wall spaced apart from and extending along at least an edge of the display protection shell to protect the display protection shell, wherein the at least one corner of the display protection shell has perpendicular edges, and wherein the wall has a segment angled and conjoined to form a pocket for receiving the at least one corner of the display protection shell, and wherein the wall is spaced apart from and extends between an upper corner to the at least one corner of the display protection shell, wherein the upper corner of the display protection shell is cut out in a diagonal direction, and wherein the wall includes a first segment extending straight along the edge of the display protection shell and a second segment connected to the first segment, the second segment curved relative to the first segment at an angle (α).