A hanger device is made of a rigid plastic material and includes a hooked portion and a plate formed below the hooked portion. The plate includes a coupling portion and a plurality of annular portions. A car mat is coupled with the coupling portion. At least one fixing device is integrally formed on at least one of the annular portions. The at least one fixing device includes a through-hole. The at least one fixing device is separable from the at least one of the annular portions. The at least one fixing device is to be mounted to the car mat.