A position measurement apparatus for measuring an absolute position of a mobile object, the position measurement apparatus includes one or more computers each including a memory and a processor configured to measure the absolute position of the mobile object based on signals transmitted from navigation satellites; measure a displacement of the mobile object from a certain position; and switching between measuring the absolute position of the mobile object and measuring the displacement of the mobile object from the certain position in accordance with a plan which is created in advance or created during movement of the mobile object.