To provide a kind of electric connector assembly having a superior positioning effect and installation efficiency, and reducing a production cost.

This electric connector is used for electrically connecting an electric card and a circuit board, and includes an electric connector and a positioning column. The electric connector has an insulating housing and a terminal. A through hole penetrating through the insulating housing is arranged in the insulating housing of the electric connector for stably positioning the circuit board and the electric connector. A through hole is arranged in a position corresponding to the through hole on the circuit board. The positioning column has a fixing part fixed in the through hole, a header part and an engaging part separately arranged on both ends of the fixing part. The fixing part is provided with an elastic arm. A stairs part is arranged in a tail end part of the elastic arm.