A stereoscopic image display device, comprising: a stereoscopic display panel unit which includes: light separating means for distributing a light ray at least into two different viewpoint directions; assuming that the direction of distributing the light ray as a first direction, a stereoscopic viewing space where a stereoscopic image is displayed by projecting a right-eye image to the right-eye of an observer and a left-eye image to the left eye of the observer, respectively; a pseudoscopic viewing space where the left-eye image is projected to the right eye and the right-eye image is projected to the left eye, respectively, which is at a position shifted from the stereoscopic viewing space in the first direction; and a 3D-crosstalk viewing space where the right-eye image and the left-eye image are projected to one of or both of the right eye and the left eye, which is between the stereoscopic viewing space and the pseudoscopic viewing space in the first direction; observer position measuring means for measuring an observing position of the observer; relative position calculating means for calculating a viewing angle between the observing position of the observer and a display panel unit of the stereoscopic display panel unit as a relative position of the stereoscopic display panel with respect to the measured observing position; device characteristic data saving means for saving device characteristic data containing a display characteristic of the stereoscopic display panel unit for the relative position; image filter value calculating means for calculating an image filter value for adjusting an image blurring amount based on the relative position and the device characteristic data; and image filtering processing means for performing image blurring processing on image data according to the image filter value. a stereoscopic display panel unit which includes: light separating means for distributing a light ray at least into two different viewpoint directions; assuming that the direction of distributing the light ray as a first direction, a stereoscopic viewing space where a stereoscopic image is displayed by projecting a right-eye image to the right-eye of an observer and a left-eye image to the left eye of the observer, respectively; a pseudoscopic viewing space where the left-eye image is projected to the right eye and the right-eye image is projected to the left eye, respectively, which is at a position shifted from the stereoscopic viewing space in the first direction; and a 3D-crosstalk viewing space where the right-eye image and the left-eye image are projected to one of or both of the right eye and the left eye, which is between the stereoscopic viewing space and the pseudoscopic viewing space in the first direction; observer position measuring means for measuring an observing position of the observer; relative position calculating means for calculating a viewing angle between the observing position of the observer and a display panel unit of the stereoscopic display panel unit as a relative position of the stereoscopic display panel with respect to the measured observing position; device characteristic data saving means for saving device characteristic data containing a display characteristic of the stereoscopic display panel unit for the relative position; image filter value calculating means for calculating an image filter value for adjusting an image blurring amount based on the relative position and the device characteristic data; and image filtering processing means for performing image blurring processing on image data according to the image filter value.