To provide a working gas circulation type engine adjustable the temperature of gas exhausted from a combustion chamber properly.

The working gas circulation type engine includes: an engine body 10 provided with the combustion chamber 11 in which a fuel and a working gas whose specific heat ratio is higher than that of air are supplied and the working gas can inflate along with the combustion of the fuel; a circulation path 20 which circulates the gas containing the working gas from the exhaust side to the intake side of the combustion chamber 11 and can supply it to the combustion chamber 11 again; an adjusting mechanism 70 provided in the circulation path 20 and adjustable the amount of working gas supplied to the combustion chamber 11; and a control device 60 that performs a warming-up control by controlling the adjusting mechanism 70 to reduce the amount of working gas to be supplied to the combustion chamber 11 compared with a normal operation after the warming-up control finishes, upon the warming-up operation to warm up the engine body 10.

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