To provide an on-rail traveling type inter-process conveyor designed to be capable of efficiently delivering subjects to be conveyed between processes without delaying conveying trucks.

This conveyor comprises two systems of rails 1, 2 placed to form respective closed loops, conveying trucks 4 traveling on the rails 1, 2 to convey subjects to be conveyer, stockers 6, 6 placed along the two systems of rails 1, 2 a transfer rail 3 placed along at least a portion of the two systems of rails 1, 2 in such a way as to form a closed loop, and a transfer conveying truck 5 traveling on the transfer rail 3 to deliver and convey the subjects to be conveyed between the stokers 6, 6 placed along the two systems of rails 1, 2.