To provide a shell and tube type multipipe heat exchanger used in a waste incinerating plant, improves heat exchange performance as the increase of a cost is suppressed, and low temperature corrosion by corrosive exhaust gas can be prevented from occurring.

In a shell and tube type multipipe heat exchanger, high temperature fluid flows through the inside of a heat transfer tube and low temperature fluid flows through the outside, and a plurality of baffle plates are situated in a low temperature fluid passage. Fins are situated on the outer periphery of the heat transfer tube at an interval at each of sections, into which a fin is partitioned by a baffle plate, and no fin is situated at a final path or an introduction path.