To provide a track structure of a transfer carriage having excellent durability and capable of reducing the wear and noise of a caster of the transfer carriage to be tolerable to practical use.
This track structure 1 travels the transfer carriage 6 having a sliding element 2 provided on one side of a vehicle width direction to be engaged to a rail 3 and the other side supported on a caster traveling road 5 via the caster 4 according to the rail 3. A sliding contact sheet 7 for bringing the caster 4 into rolling contact is adhered to the caster traveling road 5 in the vicinity of a corner part 30 of the rail 3. The sliding contact sheet 7 is a super-high molecular polyethylene sheet. The sliding contact sheet 7 is fixed to the caster traveling road 5 with a both-side adhesive tape 10. Or the sliding contact sheet 7 is fixed to the caster traveling road 5 with a bolt 12.