A head-mounted display device includes a main body including an opening formed in a rear surface thereof, a band part connected to the main body and fixing the main body to a head of a user, an image output unit disposed inside the main body to face the opening and configured to provide an image to the user, an earbud holder partially depressed into the main body and positioned at a corner between a side surface and a bottom surface of the main body, an earbud mounted on the earbud holder, and a controller configured to control the image output unit and the earbud. The head-mounted display device may be integrated with the audio output unit, thereby improving portability.