To provide carriage connecting structure capable of positioning and connecting a carriage to a conveying device with a simple constitution.

A carriage 30 is provided with a connecting part 35 comprising a pair of base part 37 extending in parallel at a holding height and position, a pair of bent part 38 gradually moving toward the direction approaching with each other as they move toward the direction of protrusion from the end of each base part 37, and a held part 39 extending toward the direction approaching with each other from the tip part of each bent part. A conveying robot 40 comprises a first arm part 61 and a second arm part 71 extending in the width direction of the conveying robot 40 at the holding height and position and approaching with each other in the front/rear direction, wherein the distance between the left and right side end edge part 71c and 71d of the second arm part 71 has the equal magnitude to the distance between the tip part of a pair of the bent part 38. Further, the second arm part 71 is arranged in the base part 37 side, and the first arm part 61 and the second arm part 71 are made get closer to hold the held part 39.