Patent ID: 8917081

Claim:
A current detection device for detecting a current flowing to a bus bar, comprising: a magnetic material core having both ends opposed to each other across a gap portion and continuously formed around a hollow portion; a magneto-electric converting element disposed in said gap portion for detecting a magnetic flux to be varied depending on a current passing through said hollow portion; and a bus bar for current detection constituted by a conductor provided with a first portion penetrating through said hollow portion of said magnetic material core in a current passing direction and plate-shaped second portions each linked to both sides in said current passing direction with respect to said first portion, the bus bar for current detection being formed such that a width of said second portion is greater than a maximum width of said hollow portion and a minimum width of a contour of a section in said first portion is greater than a thickness of said second portion, wherein said bus bar for current detection is a member having a structure in which a part of a plate-shaped metal member is folded back along cuts formed on both sides thereof, a fold-back portion constitutes said first portion and portions on both sides of said fold-back portion constitute said second portion.