A coaxial electrical connector includes an outer conductive body including a fitting portion having an opening portion for receiving a mating connector on one end portion side in a direction of an axis line, and an attachment portion formed of a surface perpendicular to the axis line on the other end portion side for attaching to a circuit board, and extending to substantially cover an area inside of a peripheral border of the fitting portion through a joining portion bent at a part of the peripheral border; a dielectric body retained and held inside of the fitting portion; and a central conductive body including a contact portion for contacting a mate central conductive body, a connection portion extending from the dielectric body in a radial direction and situated on a bottom surface of the attachment portion, and a retained portion for covering the retained portion.