We reported a case of angina pectoris with cardiac arrest immediately after treadmill exercise test, and the effect of PTCA in the same case. A 69-year-old Japanese male had chest oppression on exertion. Initial treadmill test showed 2 mm ST-segment depression in leads V4-6. Two minutes after exercise, he had atrio-ventricular (A-V) block and cardiac arrest with episodes of fainting. He was resuscitated by chest thump. Coronary angiography showed 90% stenosis in the right coronary artery (RCA). PTCA for RCA was able to dilate the stenotic lesion. The second treadmill test after PTCA did not induce bradycardia nor A-V block. It was suggested that the RCA lesion may play a critical role.