Intauterine device (IUD) is an effective and safe contraceptive method which is commonly used worldwide. However, spontaneous or iatrogenic IUD fracture was rarely occurred during usage. We present the case about spontaneous fracture of one arm of copper IUD and the spontaneous expulsion of the broken piece in a 30-year-old woman 2 years after insertion. The patient recoursed to our clinic due to finding of a foreign body at vaginal outlet. Copper IUD was dislocated in transvaginal ultrasonographic (TVUSG) examination and echogenicity of left transverse arm was not identified in transvers section. Although IUD fracture seems rarely, it must be born in mind especially when dislocation exists. Distance to fundus and its location, besides the continuity of its echogenicity and integrity should be observed during routine controls.