A head mounted image-sensing display device comprising: a pair of image-sensing means (18L, 18R) for stereoscopically capturing a physical space and outputting a pair of stereoscopic images; display means (13L, 13R, 20L, 20R) for displaying an image for a right eye and an image for a left eye based on said pair of stereoscopic images, wherein said display means includes left eye display means and right eye display means, and wherein said left eye display means and one of said pair of image-sensing means (18L, 18R), and said right eye display means and the other of said pair of image-sensing means are integrated, respectively; non-volatile storage means (26L, 26R) storing image sensing parameters for generating parallax images of a virtual object to be superimposed on the pair of stereoscopic images; acquisition means (23L, 23R) for acquiring the image sensing parameters from said storage means (26L, 26R); generation means (22L, 22R) for generating the parallax images of the virtual object using the image sensing parameters that are acquired and three-dimensional model information; and image combination means (27L, 27R) for combining the parallax images of the virtual object with the pair of stereoscopic images to output a resulting composite image to said display means; wherein the head mounted image-sensing display device further comprises an adjustment mechanism for moving said left eye display means and the one of said pair of image-sensing means, and said right eye display means and the other of said pair of image-sensing means so as to change the base line length of said pair of image-sensing means; wherein said adjustment mechanism comprises a regulating mechanism adapted to stop said movement at a plurality of predetermined stop positions; and wherein said image sensing parameters include parameters that represent a positional relationship of the pair of image sensing means and are previously measured at a time during producing and assembling the head mounted image-sensing display device for each of a plurality of base line lengths corresponding to said stop positions and stored in said storage means associated with the respective base line length as unique parameters corresponding to the individual head mounted image-sensing display device in order to take into account a difference between the actual and the design values of the image sensing parameters. a pair of image-sensing means (18L, 18R) for stereoscopically capturing a physical space and outputting a pair of stereoscopic images; display means (13L, 13R, 20L, 20R) for displaying an image for a right eye and an image for a left eye based on said pair of stereoscopic images, wherein said display means includes left eye display means and right eye display means, and wherein said left eye display means and one of said pair of image-sensing means (18L, 18R), and said right eye display means and the other of said pair of image-sensing means are integrated, respectively; non-volatile storage means (26L, 26R) storing image sensing parameters for generating parallax images of a virtual object to be superimposed on the pair of stereoscopic images; acquisition means (23L, 23R) for acquiring the image sensing parameters from said storage means (26L, 26R); generation means (22L, 22R) for generating the parallax images of the virtual object using the image sensing parameters that are acquired and three-dimensional model information; and image combination means (27L, 27R) for combining the parallax images of the virtual object with the pair of stereoscopic images to output a resulting composite image to said display means; wherein the head mounted image-sensing display device further comprises an adjustment mechanism for moving said left eye display means and the one of said pair of image-sensing means, and said right eye display means and the other of said pair of image-sensing means so as to change the base line length of said pair of image-sensing means; wherein said adjustment mechanism comprises a regulating mechanism adapted to stop said movement at a plurality of predetermined stop positions; and wherein said image sensing parameters include parameters that represent a positional relationship of the pair of image sensing means and are previously measured at a time during producing and assembling the head mounted image-sensing display device for each of a plurality of base line lengths corresponding to said stop positions and stored in said storage means associated with the respective base line length as unique parameters corresponding to the individual head mounted image-sensing display device in order to take into account a difference between the actual and the design values of the image sensing parameters.