The present report describes two female patients aged 39 and 57 years who experienced loss of consciousness and chest pain due to high-grade atrioventricular block. Both patients demonstrated noncontraction centred on the cardiac apex and excessive contraction at the cardiac base on cardiac ultrasonography and left ventriculography, but neither of them demonstrated any significant stenotic lesions on coronary angiography. Furthermore, neither patient showed elevated serum biomarkers of cardiac injury or serum viral antibodies. In a repeat left ventriculogram two weeks later, the left ventricular wall motion disorder had improved in both patients. Based on these findings, the patients were diagnosed with takotsubo cardiomyopathy. Because the high-grade atrioventricular conduction disorder did not improve in spite of the improvement of left ventricular wall motion disorder, permanent pacemaker implantation was performed. It is extremely rare for takotsubo cardiomyopathy to be complicated by high-grade atrioventricular block. In the present study, both patients had takotsubo cardiomyopathy complicated by high-grade atrioventricular block and eventually underwent permanent pacemaker implantation.