A position estimating apparatus including: a position estimating unit that compares a target in first coordinate system data indicating a position of the target by coordinates in a first coordinate system and a target in second coordinate system data indicating a position of the target present around a position estimation object by coordinates in a second coordinate system set based on a position and an attitude of the position estimation object at a predetermined starting timing, and estimates a position of the position estimation object in the first coordinate system based on a comparison result; and a comparison range adjusting unit that shrinks a coordinate range used for the comparison by the position estimating unit in the second coordinate system data when the position estimation object is turning.