A head-mounted type display device includes: a spectacle frame for fixture to a user's head; a body unit 2 fixed to the spectacle frame and having an image output unit from which image output unit image light of an image to be displayed is output; an eyepiece optical unit 3 for allowing image light output from the image output unit to be incident on the eyepiece optical unit, for guiding the incident image light to the corresponding eyeball 11 of the user with the spectacle frame being mounted on the user's head, and for displaying, as a virtual image, a magnified version of the image from the image output unit within a user's visual field; and an attachment means 4 for attaching the eyepiece optical unit 3 to the body unit in a replaceable manner. The attachment means 4 may attach at least first and second eyepiece optical units to each other in a replaceable manner, the first and second eyepiece optical units having different optical axis paths L in optical systems for guiding the image light from the image output unit to the eyeball 11.