It is an object of the present invention to provide a moving body system which can determine a moved position of a moving body such as a guided vehicle or a stacker crane wherever it is on a moving path, which can stop the moving body anywhere, and which can quickly move the moving body to a stopped position. The present invention provides a moving body system including a guided vehicle 1 moving along running rails 2, 2 constituting a moving path 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 guided vehicle 1 moves. The guided vehicle 1 includes a first detecting sensor 11 and a second detecting sensor 12 which detect the mark members 21, 21, . . . of the detected member 20.