A parallax image display device comprising: an image acquiring unit that acquires a right-eye image and a left-eye image used for generating a parallax image enabling a stereoscopic view; an information volume distribution calculating unit that calculates an information volume distribution of the right-eye image and an information volume distribution of the left-eye image; a first parallax image display unit that has a parallax image display area in which square reference regions are arranged in a grid pattern, and a parallax image generating unit that generates a parallax image by allocating at least one of a right-eye region for displaying the right-eye image and a left-eye region for displaying the left-eye image to each of the reference regions, changing and allocating the sizes of the right-eye region and the left-eye region depending on the size of the information volumes of said right-eye image and left-eye image in each of the reference regions, wherein the first parallax image display unit is capable of causing the allocated right-eye region to be observed only by the right eye of an observer, and causing the allocated left-eye region to be observed only by the other eye, wherein the information volume of each of the reference regions is at least one of an amount of harmonic signal components of the right-eye image or the left-eye image corresponding to each of the reference regions, a value of a maximum frequency of the right-eye image or the left-eye image corresponding to each of the reference regions, a variance value of a brightness distribution of the right-eye image or the left-eye image corresponding to each of the reference regions, and a difference in pixel value between the right-eye image and the left-eye image corresponding to each of the reference regions. an image acquiring unit that acquires a right-eye image and a left-eye image used for generating a parallax image enabling a stereoscopic view; an information volume distribution calculating unit that calculates an information volume distribution of the right-eye image and an information volume distribution of the left-eye image; a first parallax image display unit that has a parallax image display area in which square reference regions are arranged in a grid pattern, and a parallax image generating unit that generates a parallax image by allocating at least one of a right-eye region for displaying the right-eye image and a left-eye region for displaying the left-eye image to each of the reference regions, changing and allocating the sizes of the right-eye region and the left-eye region depending on the size of the information volumes of said right-eye image and left-eye image in each of the reference regions, wherein the first parallax image display unit is capable of causing the allocated right-eye region to be observed only by the right eye of an observer, and causing the allocated left-eye region to be observed only by the other eye, wherein the information volume of each of the reference regions is at least one of an amount of harmonic signal components of the right-eye image or the left-eye image corresponding to each of the reference regions, a value of a maximum frequency of the right-eye image or the left-eye image corresponding to each of the reference regions, a variance value of a brightness distribution of the right-eye image or the left-eye image corresponding to each of the reference regions, and a difference in pixel value between the right-eye image and the left-eye image corresponding to each of the reference regions.