An information creation device for estimating object position, comprising: object region image creation means for creating an object region image that indicates a region representing a target object in an image from each of images respectively acquired by a plurality of cameras (1a to 1n); score determination means for converting, with respect to each camera, points (x, y, z) in real space to two-dimensional coordinates corresponding to said camera, specifying a pixel value of each pixel indicated by the two-dimensional coordinates in the object region image calculated for said camera, and determining the specified pixel value as a score with respect to each combination of camera and point (x, y, z) in real space, the score indicating how accurately points in real space in each of the images respectively acquired by the plurality of cameras represent the target object; view status determination means for determining status of view to each point (x, y, z) in real space from each camera by using non-target object presence information indicating said camera where a non-target object that conceals a target object is present, and determining, with respect to each combination of camera and point (x, y, z) in real space, a first probability density function of the score in the case of said point being of the target object and a second probability density function in the case of said point not being of the target object, based on a result of the view status determination; posterior probability calculation means for determining a first posterior probability of the target object being present at each point (x, y, z) in real space by integrating the first probability density functions with respect to the plurality of cameras (1a to 1n), and determining a second posterior probability of the target object being absent at each point (x, y, z) in real space by integrating the second probability density functions with respect to the plurality of cameras (1a to In); and estimation information creation means for determining whether the target object is present or not at each point (x, y, z) in real space by comparing the determined first posterior probability with the determined second posterior probability with respect to said point (x, y, z). object region image creation means for creating an object region image that indicates a region representing a target object in an image from each of images respectively acquired by a plurality of cameras (1a to 1n); score determination means for converting, with respect to each camera, points (x, y, z) in real space to two-dimensional coordinates corresponding to said camera, specifying a pixel value of each pixel indicated by the two-dimensional coordinates in the object region image calculated for said camera, and determining the specified pixel value as a score with respect to each combination of camera and point (x, y, z) in real space, the score indicating how accurately points in real space in each of the images respectively acquired by the plurality of cameras represent the target object; view status determination means for determining status of view to each point (x, y, z) in real space from each camera by using non-target object presence information indicating said camera where a non-target object that conceals a target object is present, and determining, with respect to each combination of camera and point (x, y, z) in real space, a first probability density function of the score in the case of said point being of the target object and a second probability density function in the case of said point not being of the target object, based on a result of the view status determination; posterior probability calculation means for determining a first posterior probability of the target object being present at each point (x, y, z) in real space by integrating the first probability density functions with respect to the plurality of cameras (1a to 1n), and determining a second posterior probability of the target object being absent at each point (x, y, z) in real space by integrating the second probability density functions with respect to the plurality of cameras (1a to In); and estimation information creation means for determining whether the target object is present or not at each point (x, y, z) in real space by comparing the determined first posterior probability with the determined second posterior probability with respect to said point (x, y, z).