Among the knowledge, skills, and abilities related to safety that are required in healthcare practitioners, the present study focuses on skills other than specialized techniques (nontechnical skills), which have drawn much interest, especially in recent years. From our previous research, we know that nontechnical skills may greatly increase the safety of operating rooms, which is also increasingly being recognized by medical workers. Therefore, in this research, we investigated the usefulness of evaluation of nontechnical skills in Japan. We collected data for evaluation at a hospital from between February to and August 2014 using the nontechnical skills (NOTSS) assessment system. The total number of data sets was 270. 18 doctors participated, including five evaluators. We found it difficult for us to evaluate leadership in NOTSS. To perform NOTSS in Japan, different evaluation indicators may be necessary that change to leadership. We will propose that indicator in the future.