A pallet conveying apparatus (10, 100), comprising: a work conveying pallet; a plurality of guide rails (21, 22, 121, 122, 221, 321) configured such that the work conveying pallet is movably mounted thereon; a pallet feeding part (31, 131, 231, 331) configured to convey the work conveying pallet along the plurality of guide rails (21, 22, 121, 122, 221, 321); and a pallet moving part (41, 141, 51, 151, 61, 161, 181) configured to move the work conveying pallet from one guide rail out of the plurality of guide rails (21, 22, 122, 221, 321) to another guide rail, wherein the pallet feeding part (31, 131, 231, 331) includes a circulation belt (32, 132, 232, 332) provided along the plurality of guide rails (21, 22, 121, 122, 221, 321), the circulation belt (32, 132, 232, 332) being configured to circulate in a predetermined direction, the work conveying pallet includes: a base in the form of a flat plate having front and back principal surfaces and a plurality of side surfaces, the front and back principal surfaces being configured to carry a work; the pallet conveying apparatus (10, 100) is characterized in that: locking members are provided on at least two surfaces out of the front and back principal surfaces and the plurality of side surfaces of the base, the locking members being configured to be locked to the circulation belt (32, 132, 232, 332); the pallet feeding part (31, 131, 231, 331) is configured to convey the work conveying pallet on the one guide rail with the locking member provided on the one surface locked to the circulation belt (32, 132, 232, 332) and is configured to convey the work conveying pallet on the other guide rail with the locking member provided on the other surface locked to the circulation belt (32, 132, 232, 332); and the pallet moving part (41, 141, 51, 151, 61, 161, 181) includes a short rail (42, 142, 52, 152, 62, 162, 182) configured such that the work conveying pallet is movably mounted thereon from the one guide rail and an auxiliary belt (47, 147, 57, 157, 67, 167, 192) configured to be locked to the locking member provided on the other surface of the work conveying pallet mounted on the short rail (42, 142, 52, 152, 62, 162, 182). a work conveying pallet; a plurality of guide rails (21, 22, 121, 122, 221, 321) configured such that the work conveying pallet is movably mounted thereon; a pallet feeding part (31, 131, 231, 331) configured to convey the work conveying pallet along the plurality of guide rails (21, 22, 121, 122, 221, 321); and a pallet moving part (41, 141, 51, 151, 61, 161, 181) configured to move the work conveying pallet from one guide rail out of the plurality of guide rails (21, 22, 122, 221, 321) to another guide rail, wherein the pallet feeding part (31, 131, 231, 331) includes a circulation belt (32, 132, 232, 332) provided along the plurality of guide rails (21, 22, 121, 122, 221, 321), the circulation belt (32, 132, 232, 332) being configured to circulate in a predetermined direction, the work conveying pallet includes: a base in the form of a flat plate having front and back principal surfaces and a plurality of side surfaces, the front and back principal surfaces being configured to carry a work; the pallet conveying apparatus (10, 100) is characterized in that: locking members are provided on at least two surfaces out of the front and back principal surfaces and the plurality of side surfaces of the base, the locking members being configured to be locked to the circulation belt (32, 132, 232, 332); a base in the form of a flat plate having front and back principal surfaces and a plurality of side surfaces, the front and back principal surfaces being configured to carry a work; the pallet conveying apparatus (10, 100) is characterized in that: locking members are provided on at least two surfaces out of the front and back principal surfaces and the plurality of side surfaces of the base, the locking members being configured to be locked to the circulation belt (32, 132, 232, 332); the pallet feeding part (31, 131, 231, 331) is configured to convey the work conveying pallet on the one guide rail with the locking member provided on the one surface locked to the circulation belt (32, 132, 232, 332) and is configured to convey the work conveying pallet on the other guide rail with the locking member provided on the other surface locked to the circulation belt (32, 132, 232, 332); and the pallet moving part (41, 141, 51, 151, 61, 161, 181) includes a short rail (42, 142, 52, 152, 62, 162, 182) configured such that the work conveying pallet is movably mounted thereon from the one guide rail and an auxiliary belt (47, 147, 57, 157, 67, 167, 192) configured to be locked to the locking member provided on the other surface of the work conveying pallet mounted on the short rail (42, 142, 52, 152, 62, 162, 182).