When a passenger is in the car when a elderly person drives, the rate of accident decreases, and when the driver is a youth, it is said that a reverse phenomenon occurs. The purpose of this research is to collect more detailed data about such a phenomenon. The purpose of this research is to collect more detailed data about such a phenomenon. By analyzing the data, we aim at clarifying the mechanism why such a tendency arises. In this paper, an experiment of the passenger effect using a dialog robot and a driving simulator is proposed.