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Vehicles modified with a wheelchair transporting apparatus are generally used for improving wheelchair users'' mobility. However, in designing the apparatus, consideration for passengers'' discomfort and fatigue is not sufficient. As a countermeasure of this problem, both vibration characteristics of the passenger-wheelchair system and passengers'' sensitivity need to be studied. In previous study, authors constructed a vibration simulation model to predict vibration on passengers'' body from floor vibration. This study aims to clarify the relationship between vibration and comfort, and to propose a method to support designing WTA by the findings of this study. First, we carried out a vibration experiment with a vibration generator that vibrated the passenger-wheelchair system and measured floor vibration, vibration on the human body, and subjective evaluation. Second, we discussed experimental results.