A risk assessment device for performing risk assessment includes a diagnosis result storage unit that accumulatively stores diagnosis results of a plurality of diagnoses regarding each process device that is provided in a steam plant to be assessed, in association with installation sites of the process devices, a risk information calculation unit that calculates risk information regarding a likelihood of malfunction of a process device that is provided at a target installation site, based on diagnosis results regarding process devices that are provided at the target installation site, and a device group risk information calculation unit that calculates device group risk information regarding a likelihood of malfunction of a target device group, based on the risk information regarding installation sites of respective process devices that constitute the target device group.
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