To provide a conveying carriage system with high efficiency and high conveying capability installable in a narrow space, and a conveying carriage used for the conveying carriage system in a conveying operation of a freight.

This conveying carriage system comprises a plurality of trajectories (21 to 24) parallel extending between a freight loading area 2 and a freight unloading area 3, and a plurality of sets of conveying carriages traveling differently from other sets of conveying carriages (11 to 14) on each trajectory, and cooperatively conveying the freight with at least two carriages (11, 12) in set. The conveying carriage is characterized in that at least one conveying carriage in the set not loading the freight passes under the freight loaded to the other conveying carriage and returns to the freight loading area from the freight unloading area.