A uterine artery pseudoaneurysm (UAP) can occur after a traumatic event to the uterus, and cause massive bleeding. A uterine manipulator has been widely used for gynecologic laparoscopic surgery as basically an atraumatic instrument. We describe here a woman with a UAP caused by a uterine manipulator. She underwent laparoscopic ovarian cystectomy with a uterine manipulator due to torsion of a left ovarian cyst. Eleven days later, she came to our hospital with massive vaginal bleeding. Transvaginal Color Doppler ultrasound showed an intrauterine cystic mass with swirling blood flow, and three-dimensional arterial imaging from computed tomography revealed a UAP on the left side. Selective uterine artery angiography demonstrated a pseudoaneurysm in the distal portion of the left uterine artery, and embolization was performed successfully. A UAP should be taken into consideration in uterine bleeding after the use of a uterine manipulator.