1. An information creation device for estimating object position, comprising: object region image creation section 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 image acquisition sections; score determination section for determining a score, which indicates how accurately points in real space in each of the images respectively acquired by the plurality of image acquisition sections represent the target object targeted for position estimation, by referencing an object region image for each combination of the image acquisition section and points in real space; view status determination section for determining status of view to each point in real space from each of the image acquisition section by using non-target object presence information indicating to the image acquisition section where a non-target object that conceals a target object is present, and determining probability density functions of a score in the case of points being a target object and in the case of not being a target object for each combination of image acquisition section and points in real space in accordance with a result of the view status determination; existence probability calculation section for determining an existence probability of a target object being present at a point in real space by integrating the probability density functions corresponding to the result of determining the status of view to points in real space from the image acquisition section, and estimation information creation section for creating information for position estimation, for each point in a prescribed plane, in order to estimate at what position in the prescribed plane a target object is present, which is known to be arranged at a prescribed height relative to the prescribe plane in real space, based on the existence probability determined for each point in real space by the existence probability section.