Patent ID: 8421450

Claim:
A current detection device that detects a current flowing through a target bus bar based on a magnetic flux in the periphery of the target bus bar, the target bus bar being at least one of a plurality of bus bars arranged in parallel, wherein a sensor unit that detects a magnetic flux in a predetermined magnetic flux detection direction and includes no flux-concentrating core that orbits around the target bus bar, the sensor unit being arranged near a detection portion of the target bus bar so that the magnetic flux detection direction and a detection portion extending direction that is an extending direction of the target bus bar at the detection portion achieve an orthogonal state, a plane that is parallel to the detection portion extending direction and includes the magnetic flux detection direction is a magnetic flux detection plane, and a bus bar arranged adjacent to the target bus bar among the plurality of bus bars is an adjacent bus bar, the adjacent bus bar is configured by including a first extending section that is arranged on a first direction side on one side of an orthogonal direction with respect to the magnetic flux detection plane, and extends in a first extending direction parallel to the magnetic flux detection plane, and a second extending section that is bent at one end portion of the first extending section in the first extending direction toward the first direction side, and extends in a second extending direction that crosses the magnetic flux detection plane, and the detection portion of the target bus bar is set at an overlapping location that overlaps with the first extending section in the first extending direction.