Pseudoaneurysm of the uterine artery is rare as a cause to delayed postpartum hemorrhage. Nowadays, uterine pseudoaneurysm is often treated by uterine artery embolization. The outcome is favorable. Here, we report a case of delayed postpartum hemorrhage following Cesarean section, which was caused from a rupture of uterine pseudoaneurysm. The patient was at the point of death from excessive bleeding but successfully treated by uterine artery embolization (UAE). In encountering a case of postpartum hemorrhage after Cesarean delivery or Dilation & Curettage, it is indispensable to check the abnormal blood flow in a color Doppler examination.