A head mounted display is disclosed in this invention. The head mounted display includes a display module, a removable supporting frame, and a removable clamping device. The display module is connected to a multi-media player. The removable supporting frame is disposed on the display module. The removable clamping device is disposed on the display module so as to clip eyeglasses of a user. A real-time video device is also disclosed in this invention. The real-time video device includes an image capturing device, a receiving device, and a head mounted display. The image capturing device is able to capture a motion image of a user continuously and transfer a signal of the motion image. The receiving device is used to receive the signal of the motion image. The head mounted display is mounted on the head of the user; the motion image is displayed on a display element of the head mounted display instantaneously.