To change a conveying pitch without changing a pallet.

The pallet conveying device has: one or two or more of pallets 11 to have a workpiece mounted thereon; first and second pallet rails 12, 13 for movably mounting the pallet; first and second pallet feeding mechanisms 26, 28 for conveying the pallet; and a pallet movement mechanism 20 for moving the pallet mounted on the first or second pallet rail to the second or first pallet rail. The pallet movement mechanism 20 has a first movable part 12b constituting a portion of the first pallet rail, separated/moved from the other portion and to continue to the second pallet rail; and a second movable part 13b constituting a portion of the second pallet rail, separated/moved from the other portion and capable of being continued to the first pallet rail. The first and second pallet feeding mechanisms have first and second belts 27, 29 constituted engageably with the pallets mounted on the respective pallet rails and circulated with endless.