According to the statistics of 'condition of accidental benefits' by Independent Administrative Agency Japan Sport Council, More students' injury under school control in junior high school happens than other kinds of schools. The injury is due to the human and environmental factor. In this study students' self-consciousness in the human factor was focused on. To get the clue for the prevention of students' injury, it was checked how much students pay attention to themselves with a questionnaire. From the result, through the comparison of the number of visiting a nursery room for their injury, the relationship between the frequency of their injury and their self-consciousness was inspected. As a consequence, students who have injury a lot have less concerned to themselves. This indicated the possibility that students' low self-consciousness, especially their personal self-consciousness influenced the frequency of their injury.