An estimation apparatus executes an estimation method of out-of-plane deformation of a cable having a winding curl, the method including an input step of inputting parameters needed for the estimation; a step of deriving a value of an equivalent material property of the cable; a step of making a finite element analysis model reproducing the winding curl; a step of deforming the cable model to be in a straight state and calculating a stress distribution; a step of setting a rotational angle for determining an installation direction of the winding curl; a step of setting the calculated stress distribution and the set rotational angle to be initial states, deforming the straight cable model according to a load condition input at the input step, and calculating a deformation state and an amount of the out-of-plane deformation; and a step of outputting calculation results to an output device.
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