The computer performs rigidity analysis by using a vehicle body skeleton model (1) of an automobile which has a fixed connection portion (3) for fixing or connecting a fitting or a cover material and has at least one of a planar element and a stereoscopic element. Or the mass corresponding to the mass of the fitting or the covering material is set at a predetermined position in a region where the covering material is fixed or connected to the fixed connection portion 3 of the body skeleton model 1 to generate the mass setting body skeleton model 21 A stiffness analysis step (S3) for performing a stiffness analysis on the mass-setting body-skeleton model generation step (S1) and the mass-setting body-structure skeleton model (21) in consideration of the inertial force acting at the time of running of the vehicle .
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