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A joint part which allows connection work to be easily performed and a wiring harness using the same. A joint part A has a housing (60) including a first joint portion (10) arranged to make a concurrent connection of ends of electric wires drawn from positive terminals of a plurality of igniters (3)

A joint part which allows connection work to be easily performed and a wiring harness using the same. A joint part A has a housing (60) including a first joint portion (10) arranged to make a concurrent connection of ends of electric wires drawn from positive terminals of a plurality of igniters (3) and positive terminals of a plurality of injectors (4) and an end of an electric wire drawn from a positive terminal of a power supply (5) for the igniters (3) and the injectors (4), a second joint portion (20) arranged to make a concurrent connection of ends of electric wires drawn from negative terminals of the igniters (3), and a ground terminal (40) to which the first joint portion (10) is connected via a noise filter (50), and the second joint portion (20) is directly connected.

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The invention claimed is: 1. A joint part comprising: a housing comprising: a first joint portion arranged to make a concurrent connection of ends of electric wires drawn from positive terminals of a plurality of ignition mechanisms and positive terminals of a plurality of fuel injection mechanisms

The invention claimed is: 1. A joint part comprising: a housing comprising: a first joint portion arranged to make a concurrent connection of ends of electric wires drawn from positive terminals of a plurality of ignition mechanisms and positive terminals of a plurality of fuel injection mechanisms and an end of an electric wire drawn from a positive terminal of a power supply for the mechanisms; a second joint portion arranged to make a concurrent connection of ends of electric wires drawn from negative terminals of the ignition mechanisms; a ground terminal to which ends of electric wires drawn from a ground are connected; and a noise filter disposed in the housing and connected between the ground terminal and the first joint portion, wherein in the housing, the second joint portion is connected between the noise filter and the ground terminal. 2. A joint part comprising: a housing comprising: a first joint portion arranged to make a concurrent connection of ends of electric wires drawn from positive terminals of a plurality of ignition mechanisms and positive terminals of a plurality of fuel injection mechanisms and an end of an electric wire drawn from a positive terminal of a power supply for the mechanisms; and a second joint portion arranged to make a concurrent connection of ends of electric wires drawn from negative terminals of the ignition mechanisms and an end of an electric wire drawn from a ground; and a noise filter disposed in the housing and connected between the first joint portion and the second joint portion. 3. The joint part according to claim 1, wherein the housing further comprises a third joint portion arranged to make a concurrent connection of ends of electric wires which transmit returned signals for control signals inputted to the ignition mechanisms from a control device which controls the ignition timing of the ignition mechanisms. 4. The joint part according to claim 1, wherein at least the noise filter is subjected to enveloped casting of a resin to be molded. 5. A wiring harness comprising the joint part according to claim 1. 6. The joint part according to claim 2, wherein the housing further comprises a third joint portion arranged to make a concurrent connection of ends of electric wires which transmit returned signals for control signals inputted to the ignition mechanisms from a control device which controls the ignition timing of the ignition mechanisms. 7. The joint part according to claim 2, wherein at least the noise filter is subjected to enveloped casting of a resin to be molded. 8. The joint part according to claim 3, wherein at least the noise filter is subjected to enveloped casting of a resin to be molded. 9. The joint part according to claim 6, wherein at least the noise filter is subjected to enveloped casting of a resin to be molded. 10. A wiring harness comprising the joint part according to claim 2. 11. A wiring harness comprising the joint part according to claim 3. 12. A wiring harness comprising the joint part according to claim 6. 13. A wiring harness comprising the joint part according to claim 4. 14. A wiring harness comprising the joint part according to claim 7. 15. A wiring harness comprising the joint part according to claim 8. 16. A wiring harness comprising the joint part according to claim 9.