To provide a crack development evaluating device for evaluating the development of a crack, until a crack reaches final breakage, after the initial crack is produced in a continuous object.

An analyzing model forming part 11 forms an analytic model used in the analysis due to finite-element method and a stress-strain analysis part 12 uses the analytic model to analyze the stresses and strains, which develops in the finite element of the continuous object by load at each cycle of the load repeatedly applied to the continuous object by finite-element method. An element damage evaluating part 13 evaluates the damages caused by the strain with respect to the finite element of the continuous object, on the basis of the analysis result for each cycle of the load and a crack development display part 15 displays the development state of the crack produced in the continuous object, on the basis of the evaluation result of the damage.