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). <EOS>