The questioning by Fatigue Scale of Industrial Fatigue Research Committee of Japan Association of Industrial Health was done on the resident doctors of Yamaguchi Medical School Hospital and Yamaguchi Pref. Central Hospital. The results were as follows: 1) The frequency of fatigue complaints in the resident doctors was obviously higher than that of average workers in twenties. 2) The high frequency of fatigue complaints in the resident doctor is probably due their long and irregular duty-time. 3) The frequency of fatigue complaints in May was not significantly different from that in November. 4) The three components were arranged I>II>III according to the frequency by types. This pattern belongs to ”Mental Work : Night Work”.