To provide a bus bar circuit structure having a new structure, capable of ensuring satisfactory conductivity while achieving superior versatility and the yield.

The bus bar structure 10 is configured by including two bus bars 12a, 12b, and a joint metal fixture 14 incorporated between connection side ends 40, 40 of the two bus bars 12a, 12b to conduct the two bus bars 12a, 12b to each other. In the joint metal fixture 14, a clamper 37 for clamping the two bus bars 12a, 12b in a plate thickness direction is formed, and locking protrusions 38a, 38b formed on the joint metal fixture 14 are inserted into slits 44, 44 formed on the two bus bars 12a, 12b to form a ratcher for blocking coming-off of the bus bars 12a, 12b from the joint metal fixture 14.