It is an object of the present invention to provide a moving body system which can determine the moving position of a vehicle, stacker crane, or other moving body wherever on a moving path having a branching portion or a joining portion the moving body is, the system being able to precisely stop the moving body at any position and enabling the moving body to move fast to a stop position. A moving body system includes a vehicle 1 moving along running rails 2, 2 constituting a moving path having a joining portion and a detected member 20 laid along the running rails 2, 2. The detected member 20 includes a large number of mark members 21, 21, . . . in a direction in which the vehicle 1 moves. The vehicle 1 includes a first detecting sensor 11 and a second detecting sensor 12 which detect the mark members of the detected member 20.