The layout of switch button was addressed in the many previous studies. The most of them was related with the switch buttons controlled by human hands or fingers. This study addressed the layout of switch button that is controlled by the human foot. Human performance (e.g. movement time and error rate) was measured according to the number of button and the layout pattern. The human performance was decreased with increase of the number of button. The number of button which can be recommended was less than 4buttons in this study. On the other hand, it has been reported that foot movement rotating foot ankle is more efficient than foot movement straightly moving foot itself. However, the button layout leading rotating foot ankle was not significantly superior to the other button layouts in this study.