An object is to easily manage inventory information of an moving body such as a work machine at each physical distribution center substantially in real time, and an moving body 1 is provided with a positional information obtaining unit 22 for obtaining positional information of the moving body 1 at a predetermined timing, an operating state information obtaining unit 23 for obtaining operating state information of the moving body 1, and an inventory information output controller 24 for transmitting management information 37 which identifies the moving body 1, area information 35 which indicates an area in which the moving body 1 is located, and stay period information 38 in which this stays in the area to a management device 2 as the inventory information when the moving body 1 is located in any of one or more areas set in advance based on the positional information.