PURPOSE: To simplify connection operations by integrally connecting an earth terminal housing section which receives piled-up two earth terminals, while being ranged in a multi-storied shape, and letting a groove be composed of a conductive U-shaped groove at the earth terminal insertion hole.

CONSTITUTION: Earth terminal housing sections 2A, 2B and 2C have a bolt hole 3 bored for an installation bolt 11 at each center of plate connection sections 9, and also have two earth terminals 10A and 10B piled up for plate terminals provided for each end section of the earth wires 12 of a wire harness. The earth terminals are inserted into the insertion hole 8 of a U shaped groove 6 at the groove end. After the piled-up two terminals 10A and 10B have been inserted and set, the bolt 11 is inserted into the hole 3, a base plate 4 is rested on the earth connection section 13 of a car body, and the bolt 11 is then fastened. This constitution thereby allows a collective connection terminal 1 to be connected to the car body side by the bolt 11, fixed so as to be conductive therewith, and also allows an earth circuit group to the car body for the earth wires 12 relayed to the terminal 1 to be collectively formed. By this constitution, freedom for setting the earth circuit of the wire harness can thereby be enhanced.