PURPOSE: To ensure a combustion chamber capable of being assembled into a compact form between a compressor and a turbine, and promoting a combustion process in the combustion chamber with maximum efficiency and the minimum emission of harmful matter.

CONSTITUTION: A pressure wave machine 2 where a combustion chamber is disposed between a compressor 1 and turbines 3, 4 includes a cell rotor 13 having rotor cells 13a of a predetermined number disposed peripherally and casings 19, 20 enclosing the whole periphery and opposite end surfaces of the cell rotor 13. The casings 19, 20 are connected with the compressor 1 via at least one passage 7, and are connected with turbines 3, 4 via at least other passages 8, 9.