To provide an analyzing technique capable of precisely simulating the behavior of an elastic material when external force is applied to the elastic material being an analyzing object.

In order to simulate the behavior of the elastic material to the external force when the external force is applied to the elastic material, this method for structural analysis of the elastic material has a step for differentiating stress σ, which is generated at the elastic material at a prescribed time(t) when the external force is applied to the elastic material, by distortion ; a step for obtaining a reference stress value σ0 corresponding to the static deformation of the elastic material; a step for obtaining a difference stress Δσ (t) by integrating a variable f () concerning the compression rigidity of the elastic material by a prescribed time increment; and a step for obtaining a stress value σ(T) at an analyzing time T by adding a value obtained by accumulating the difference stress Δσ (t) since the time of starting loading of the external force until a prescribed analyzing time T to the reference stress value σ0.