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In motorcycle development, weight reduction is important for save resources and reduce environmental impact. On the other hand, it is important to verify the strength and durability of structural materials, such as the frame body, and it is especially important to estimate the loads applied to individual parts when traveling on rough roads at the initial stage of the design. Regarding motorcycle models, a simulation technique for running on rough roads has already been proposed. However, when this simulation technique, as it is, was applied to scooters, a large error occurred in the estimated load values. This was thought to be due to insufficient modeling of the structures and characteristics specific to scooters. Therefore, in this study, in order to develop a simulation model to estimate the loads on the frame body of a scooter, we considered it necessary to obtain these load transmission characteristics and attempted to model them specifically for the scooter.