To prevent uneven contact of a main rail by enabling a driving wheel and a rolling wheel to make full contact even in occurrence of the tilt of the upper surface of the main rail generated when a slope is curved by forming the main rail for guiding a tractor into a round pipe and forming the driving wheel and the rolling wheel into drum shapes along the round pipe, and to prevent falling by disposing outriggers each having a wheel rolling on a sub rail, in a truck for a multi-rail track traveling on the main rail and the sub rail.

The truck for the multi-rail track includes a tractor and a load carrier traveling by being guided on a main rail railroaded in the center and sub rails railroaded on both sides of the main rail. In the truck for the multi-rail track, the tractor vertically holds the main rail by using a driving wheel engaged with a rack fixed to the lower surface of the main rail and a rolling wheel rolling on the upper surface of the main rail, and the outriggers are prepared to allow the wheels disposed at the lower ends of the outriggers to roll on the sub rails, respectively, and also the main rail is formed into a round pipe circular in section, and the driving wheel and the rolling wheel are formed into hand drum shapes along a surface of the round pipe main rail.