A head mounted display, comprising: a display; a lens unit; a body coupled to the display; a supporting unit coupled to the body and configured to support the body; a lens driving unit coupled to the body; and wherein the lens driving unit includes: a lens frame coupled to the body, wherein the lens frame includes a first tube portion that protrudes in a first direction; a plate positioned at a lower end of the lens frame and extending from the first tube portion; a lens housing that includes the lens unit and a second tube portion that protrudes in the first direction, the second tube portion being positionable relative to the first tube portion; wherein the second tube portion comprises a first protrusion and a second protrusion, wherein the first protrusion and the second protrusion are formed at opposite positions on an outer circumferential surface of the lens housing; a link unit coupled to the lens frame and the lens housing, wherein the link unit comprises: a first link portion having one end coupled to the plate, and another end coupled to the first protrusion and which is moved together with the second tube portion; and a second link portion having one end coupled to the plate, and another end coupled to the second protrusion and which is moved together with the second tube portion, wherein the first link portion and the second link portion are coupled to each other at middle regions thereof and are formed to cross each other at the middle regions; and a driving unit coupled to one side of the first protrusion of the second tube portion and being configured to drive the link unit to change relative positioning of the lens housing and the lens frame. a display; a lens unit; a body coupled to the display; a supporting unit coupled to the body and configured to support the body; a lens driving unit coupled to the body; and wherein the lens driving unit includes: a lens frame coupled to the body, wherein the lens frame includes a first tube portion that protrudes in a first direction; a plate positioned at a lower end of the lens frame and extending from the first tube portion; a lens housing that includes the lens unit and a second tube portion that protrudes in the first direction, the second tube portion being positionable relative to the first tube portion; wherein the second tube portion comprises a first protrusion and a second protrusion, wherein the first protrusion and the second protrusion are formed at opposite positions on an outer circumferential surface of the lens housing; a link unit coupled to the lens frame and the lens housing, wherein the link unit comprises: a first link portion having one end coupled to the plate, and another end coupled to the first protrusion and which is moved together with the second tube portion; and a second link portion having one end coupled to the plate, and another end coupled to the second protrusion and which is moved together with the second tube portion, wherein the first link portion and the second link portion are coupled to each other at middle regions thereof and are formed to cross each other at the middle regions; and a driving unit coupled to one side of the first protrusion of the second tube portion and being configured to drive the link unit to change relative positioning of the lens housing and the lens frame. a lens frame coupled to the body, wherein the lens frame includes a first tube portion that protrudes in a first direction; a plate positioned at a lower end of the lens frame and extending from the first tube portion; a lens housing that includes the lens unit and a second tube portion that protrudes in the first direction, the second tube portion being positionable relative to the first tube portion; wherein the second tube portion comprises a first protrusion and a second protrusion, wherein the first protrusion and the second protrusion are formed at opposite positions on an outer circumferential surface of the lens housing; a link unit coupled to the lens frame and the lens housing, wherein the link unit comprises: a first link portion having one end coupled to the plate, and another end coupled to the first protrusion and which is moved together with the second tube portion; and a second link portion having one end coupled to the plate, and another end coupled to the second protrusion and which is moved together with the second tube portion, wherein the first link portion and the second link portion are coupled to each other at middle regions thereof and are formed to cross each other at the middle regions; and a driving unit coupled to one side of the first protrusion of the second tube portion and being configured to drive the link unit to change relative positioning of the lens housing and the lens frame. a first link portion having one end coupled to the plate, and another end coupled to the first protrusion and which is moved together with the second tube portion; and a second link portion having one end coupled to the plate, and another end coupled to the second protrusion and which is moved together with the second tube portion, wherein the first link portion and the second link portion are coupled to each other at middle regions thereof and are formed to cross each other at the middle regions; and a driving unit coupled to one side of the first protrusion of the second tube portion and being configured to drive the link unit to change relative positioning of the lens housing and the lens frame.