|Interpersonal touch is said to have significant effects on social interaction. We used the ultimatum game to examine whether touch from a robot could have significant effects on human-robot interaction. We prepared two experimental conditions: the one was “touch condition” in which unfair proposals were offered to a participant while a robot touched his/her arm and the other was “no touch condition” in which unfair proposals were offered while the robot did not touch. We compared Medial Frontal Negativity (MFN) measured by EEG，whose amplitude is correlated with feeling of unfairness，between the two conditions. Result shows that MFN amplitude was larger in the no touch condition than in the touch condition. This indicates that touch from a robot may inhibit a sense of unfairness for the robot. Our finding suggests that touch from a robot could inhibit negative feeling to the robot.