A head mounted display device has a frame. The frame includes a front portion mountable on a nose of a user, and extending to a right side edge of the front portion, and to a left side edge of the front portion, in front of at least one eye of the user, a connection portion connected to an edge portion of at least one of the right and left side edge, and the connection portion extends rearward from the edge portion, and a temple portion configured to be mountable on an ear of the user, rotatably connected to the connection portion, and rotates around a rotation axis. The head mounted display also has an image display unit having an optical system, for generating an image to be displayed at a position viewable by the user, and a retaining mechanism to hold the image display unit within the connection portion.