Carcinomas other than adenocarcinomas are extremely rare in the fallopian tube. A 42-year-old woman with watery, intermittent vaginal discharge was found to have a left adnexal tumor. This case was diagnosed as primary carcinoma of the fallopian tube, FIGO Stage Ia. She underwent a total abdominal hysterectomy, a bilateral salpingo-oophorectomy, a pelvic and periaortic lymphoadenectomy, and an omentectomy, followed by cisplatin-based chemotherapy. Four years after the initial diagnosis of the disease, she remains in a disease-free state. Histologically, the tumor revealed a primary transitional cell carcinoma of the left fallopian tube. The findings on an immunohistochemical test for an epithelial membrane antigen, the CA125 antigen, were positive, whereas findings on a test for CEA were negative. We report a case of a malignant neoplasm of the fallopian tube with histological features of transitional cell carcinoma that arose from the tubal epithelium.