Abstract: A joint device is provided to increase the number of wires connectable with one bolt. The joint device includes an insulation casing 3 with a terminal insertion opening 9. A bolt 2 projects from a bottom wall of the casing 3 and a terminal table 11 is mounted around and over the bolt 2. A mount hole 4c of an LA terminal 4b is fitted down on a shaft 2a of the bolt 2; and a wire 4a extending from the terminal 4b is inserted into a wire insertion slot 8a in the casing. Next, a second LA terminal 5b is inserted in a manner similar to the above. A mount hole 5c of the LA terminal 5b is fitted down on the shaft 2a of the bolt 2; and a wire 5a is inserted into an adjacent wire insertion slot 8b. Further, a mount hole 6c of a third LA terminal 6b is fitted down on the shaft 2a of the bolt 2 and a wire 6a is inserted into the wire insertion slot 8a as the wire 4a corresponding to the first LA terminal 4b and been.