A characteristic of the Nehb lead system and especially a value of the lead Nehb-D were studied in 136 subjects 1) The lead Nehb-D was similar to the lead V(7), the lead Nehb-A to the lead V(5) and the lead Nehb-J to the lead V(3). Those similarities were about 50 per cent each. 2) On a form of QRS complex of the Nehb lead system, the lead D was mostly qR type. The lead A was mostly qRs, then RS and qRs type in order of frequency. The lead J was mostly RS type. 3) The electrocardiograms of 80 healthy men were all normal both in the standard lead system and in the Nehb lead system. 4) The number of cases of abnormal ST changes at rest were 22 in the standard lead system and 55 in the lead Nehb-D out of 136 cases. 5) The number of abnormal ST-T changes after exercise tests were 61 in the standard lead system and 90 in the Nehb lead system. 6) In the cases with abnormal ST-T changes only in the leads Ⅱ, Ⅲ and aVf, the abnormal ST-T changes of the lead Nehb-D were a few.