Fault Tree Generation Device and Fault Tree Generation Method

A fault tree in which causes for failure events are appropriately developed is generated. A fault tree generation device according to the present invention includes a formula database that stores formulas related to physical phenomena, a formula base causal model generation unit that generates a causal relationship of failure events based on the formulas, a formula base fault tree generation unit that generates a formula base fault tree that is a combination of the causal relationships of the failure events, and an output unit that outputs the formula base fault tree.