A coaxial electric connector includes primarily a dielectric shell and a housing unit which is in an arc shape. The dielectric shell is formed by extrusion formation based on the housing unit and defines an annular space, with a predetermined wall being formed with two fixing sections to define the arc according to the housing unit. Besides, a bottom of the dielectric shell is a dielectric base and an interior of the dielectric shell contains additionally a conductor, a position of which is fixed by the dielectric base. A conductor pin on the conductor, whereas, is extended outward from the dielectric base. Through wrapping of the dielectric shell, the housing unit increases roundness of the entire housing and decreases scratching on a surface of metal part, which occurs when manufacturing the products, thereby improving a yield rate and a service life of the products.