A 72-year-old woman was diagnosed with bladder cancer (cT3bN0M0). After 2 cycles of GC (gemcitabine，cisplatin) neoadjuvant chemotherapy, the patient underwent a cystectomy and ileal conduit construction. Pathological findings showed urothelial carcinoma, high grade, G2＞G3, pT3a, INFβ, ly0, v1. Six months after the operation, metastases to the liver, lung, left adrenal gland, rib, multiple lymph nodes, and peritoneum were revealed. Under palliative care, she suffered from palpitation and general fatigue. Electrocardiogram findings showed a complete atrioventricular block, while echocardiography and computed tomography revealed cardiac metastasis. We diagnosed her with complete atrioventricular block due to cardiac metastasis from bladder cancer. She died 7 days after onset of the complete atrioventricular block without use of a pacemaker.