A risk assessment device includes a diagnosis result storage unit that accumulatively stores diagnosis results of a plurality of diagnoses regarding each process device in association with installation sites of the process devices, a calculation model storage unit (334) that stores a calculation model for calculating a probability of malfunction of a process device, a malfunction ratio calculation unit (335) that calculates, based on diagnosis results regarding process devices that are and have been provided at a target installation site, a malfunction ratio that is a ratio of process devices that had malfunctioned by the time a reference period had elapsed from when the process devices were installed at the target installation site, a malfunction probability calculation unit (336) that calculates, based on the calculation model, a probability of malfunction that is a probability that a process device provided at the target installation site will malfunction within the reference period, and a risk index value calculation unit (33) that calculates a risk index value of a process device provided at the target installation site, through comparison between the calculated malfunction ratio and the calculated probability of malfunction.
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