We report a case of submucous tumor treated using laparoscopic ultrasound. The patient, a 38-year-old female who had undergone hysteroscopic surgery for submucous myomas twice in the past, visited us complaining of hypermenorrhea and dysmenorrhea. Vaginal ultrasound and magnetic resonance imaging (MRI) showed a submucous tumor about 6cm in diameter and an adenomyosis lesion in the uterus. We planned laparoscopic surgery assisted by laparoscopic ultrasound, and carried it out successfully. The laparoscopic ultrasound visualized the adenomyoma and adenomyosis and helped us perform a safe and complete operation.