A head-mounted display for forming a virtual image at a predetermined distance in front of a user includes: a left eye unit and a right eye unit, each eye unit having an image module for generating an image and an optical system disposed at a predetermined distance from the image module and towards the user's eyeball for forming a virtual image at a predetermined distance from the user by enlarging the generated image. A main body has both the left eye unit and the right eye connected thereto, wherein portions of the main body to which the left eye unit and the right eye unit are connected are each inclined to sustain a predetermined angle from the center of the main body. By utilizing a user's visual convergence so that a virtual image may be displayed at a target position, variation of a distance determination between users is reduced, and thus a viewing effect to the user of a virtual image being formed at a target position is obtained, thereby improving user satisfaction.