An electrical connector and an electrical wire connection method for connecting electrical connectors with each other are provided. The electrical connector includes a conductive body, a conductive material, and a cable member. One of two ends of the conductive body includes an insertion portion, the other end of the conductive body includes a wire-connection post, and the wire-connection post has a groove. The conductive material is disposed in the groove. The cable member includes core wires inserted into the groove. The conductive medium is distributed over the space between the core wires and the groove.