A plug-in type connector for connecting a bus bar to an electric equipment in various switch boards used in a control center etc. comprises an insulation case having a hollow chamber for containing a contact element; and a U-shape contact element which is connected to said insulation case to dispose contacting parts at an opening of the hollow chamber and to dispose a lead wire to the opposite end and which is kept in a floating condition. The lead wire is connected to the electric equipment in the switch board and the contacting part is electrically connected to the bus bar.