To provide a truck transporting device able to cross another passage without hindrance without resorting to a large-scale facility nor having a restriction about the layout of a transporting line.

The truck transporting device works with an arrangement that two guide pins 13 installed on a truck 10 are engaged with a main guide rail 12 laid on a truck running path 22 and runs the truck 10 on the transport line L while the truck 10 is kept in a constant attitude, in which the main guide rail 12 is divided by the passage T section intersecting the truck running path 22, wherein two auxiliary guide rails 23 and 24 are laid in positions nearer the operator and remote therefrom about the truck running direction F with the passage T interposed in such a manner as parallel with the main guide rail 12 and positioned on its two sides, and auxiliary guide pins 25 and 26 installed on each truck 10 are engaged alternately with the auxiliary guide rails 23 and 24, and the truck 10 is allowed to cross the passage T with the attitude maintained constantly.