摘要：Subjective influence of noise by questionary investigation were analysed. 1) The subjectve influence of internal noise at Aoba Elementary School was greater than that of external for a little traffic sound. 2) The subjective influence of external noise at Fujieda-kita High School was greater than that of internal, because the traffic sound at Fujieda-kita High School was five times as much as that at Aoba Elementary School. Some pupil, however, even at the former school was annoyed by internal noise. From the above facts, teachers and investigators must not reconsider only the influences by external noise but also that by internal.
