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The authors’ goal is to develop brakes that are more satisfying to users in sensory aspects by explaining the relationship between people’s state of mind and a vehicle’s physical quantities. However, there are no scales to measure such feeling. In this study, a psychological scale was constructed to measure the affective state of general automobile drivers, for the purpose of clarifying the effects of brake characteristics on the affective state. To construct the affective scale, two experiments were conducted. In the first experiment, a comparison of four types of vehicles was performed and then an interview survey was conducted to collect a broad sample of terms used to evaluate the affective state. From the results, it was hypothesized that the evaluation terms were divided into eight categories.