This paper aimed at analyzing the psychology of the people who tunes the car from the point of view of the theory of unconscious desire. The theory of unconscious desire to approach human psychology has two features. One point is that it can be applied only to human beings in the sense that animals does not have the unconscious. The other is that we can categorize some types of underlying unconscious desire instead of seeing human desire as the sundry desires according to the specific target. In this paper, we looked at the characteristics of each type of data obtained through interviews for people to tune the car from the point of view of the theory of unconscious desire.