At the same time and the line connection of the electric wire when the electric wiring, such as the drop line cable as a wire connection and a branch connector that can be access directly branch to a source device of the watt-hour meter or the like, the case (10), two connection holder mounted in the casing (20a, 20b and a). Connection holder connection groove (21a, 21b) for receiving the wires in both directions are formed, the bolt member of the second modification of the third one for each connection groove is entered into (24a, 24b, 25a, 25a'25b, 25b ') . Bolt member 3 gaejung one and bolt members (24a, 24b) is for a branch projecting connecting holder upper side can be concluded as to the watt-hour meter such as the outside of the device connection (pair), the other two (pair) (25a, 25a ', 25b, 25b' for a) is inserted in both directions wires L1, L2 and L1 ', L2' of the straight line connection. That is, the external device can be connected directly without the need for a separate branch of the branch line connected to the line at the same time is very easy, in particular, seek to a stable connection with a high intensity in response to the thickness of the wire. Wires, connections, branches, connections, holder, volt, watt-hour meter