The adenomatoid tumor is a rare benign neoplasm which is usually a small circumscribed lesion of the female and male genital tract characterized by adenomatous structure and it's histogenesis has been controversial. We experienced a case of an unusually large adenomatoid tumor of the fallopian tube in 54 year old female. Grossly, the tumor was firm and gray white to yellow and large(7㎝ in diameter), which found beneath the serosa in the isthmic portion of the fallopian tube. Microscopicall, the tumor consisted of irregular glands or vessel like spaces which were lined by flattened endothelial like cells or plump cuboidal cells. A brief review of the literature was made.