There are provided a fatigue crack growth curve estimation method, an estimation program, and an estimation device capable of strictly estimating the detail of the metal fatigue end and the crack growth detail. The fatigue crack growth curve estimation device (1) uses a first calculation means (11), second calculation means (12), third calculation means (13), fourth calculation means (14), and fifth calculation means (15) to strictly estimate the detail of growth of a crack generated and growing in a first grain while omitting a calculation on the load pair not contributing to growth of the crack.
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