In the case where each of the plurality of aggregates includes a plurality of parts, the failure degree calculation device (2) determines each of the plurality of aggregates based on the physical quantity of at least one of the plurality of aggregates. With respect to, there is provided an aggregate failure degree calculation unit (21) for calculating an aggregate failure degree indicating the probability of failure. The failure degree calculation device (2) is based on the connection data indicating the connection state with other parts and the aggregate failure degree for each of the plurality of components included in a specific assembly of the plurality of aggregates. Further, a component failure degree calculation unit (22) for calculating a component failure degree indicating a failure probability is further provided.
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