A stereoscopic image display device, with which the influence of a CT-image by the 3D crosstalk is lightened so that a sense of discomfort is not felt by the observer even when the observing position of the observer is shifted, includes an image processing unit including: a relative position calculating unit which calculates a relative position of a stereoscopic display panel with respect to the observing position of the observer; an image filter value calculating unit which calculates an image filter value for adjusting an image blurring amount according to the relative position; and an image filtering processing unit which performs image filtering processing on image data according to the image filter value.