Provided is a reignition processing device of a gas engine which executes a reignition process of a cylinder during operation of the gas engine that includes a plurality of cylinders, the device being provided with: an execution allowance unit configured to, when misfiring has occurred in at least one of a plurality of cylinders, determine whether to allow the execution of a reignition process for the cylinder in which misfiring has occurred on the basis of a damage diagnosis result based on the internal pressure of the cylinder in which misfiring has occurred, the presence or absence of an abnormality in a control device for executing a combustion control and combustion diagnosis of the gas engine, an operation history pertaining to the cylinder in which misfiring has occurred, and the operating state of the gas engine; and a reignition execution unit configured to execute a reignition process for the cylinder in which misfiring has occurred and for which the reignition process has been allowed to be executed according to the allowance determination.
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