PURPOSE: To enable conveyance of apparatuses and materials, which are decreased in size and weight, at a high speed, by providing a fluid forced-carrying vehicle, provided with permanent magnets and driven within a line, and a case, provided with permanent magnets and slidably engaged with the outer periphery of a line.

CONSTITUTION: A pneumatic carrying vehicle (fluid forced-carrying vehicle) 2 is provided with permanent magnets 141 and 142 having polarity directed to the axial direction of a line, and is driven within a gas feed pipe 1 by a fluid pressure. Meanwhile, a running vehicle (case) 3 is slidably engaged with the outer periphery of the gas feed pipe 1, has horsenshoe-shaped permanent magnets 181 and 182 having polarity inverse to those of and positioned at a distance equal to those of the magnets 141 and 142, and the magnets 141, 142, 181, and 182 force a running vehicle 3 to be stably positioned to the pneumatic carrying vehicle 2 in association with each other. Running of the pneumatic carrying vehicle 2 and the running vehicle 3 is controlled by magnetic sensors 101W10n, mounted to the pneumatic carrier 1, and a controller 11. since, as noted above, the peumatic carrying vehicle 2 and the running vehicle have no built-in driving part, even if a speed is increased, they are prevented from an increase in size.