Abstract: A magnetically guided unmanned vehicle system to carry various loads along a guide path of a closed loop which comprises guide path consists of magnetic tape, a magnetic guide type steering drive unit having a magnetic sensor to detect magnetism from said tape and a drive wheel, said steering drive unit having a driving means to drive said drive wheel and a steering means controlled automatically by signals detected by said magnetic sensor, a trolley which has wheels at each of the four corners of the lower surface of a chassis thereof, the front said wheels having a universal casters, and a carriage shelf assembly which has one or a plurality of horizontal automatic roller conveyer(s) as shelves. The magnetically guided vehicle can be constructed by combining the trolley, the steering drive unit and the carriage shelf assembly and the trolley can be used for its original purposes by disassembling such parts.