To provide a current detector capable of preventing deformation and breakage by securing sufficient strength.

The current detector 100 includes: a first fixed part 112 fixed to a wiring conductor on a battery 200 side to perform electrical connection; a second fixed part 114 to which a harness 300 is fixed to perform electrical connection; a busbar 110 formed integrally with these fixed parts; a circuit board 120 on which a current detection circuit is mounted for detecting a current flowing through a resistor formed integrally with or separately from the busbar 110, on the basis of the difference in voltage between two spots of the resistor; and a case 130 arranged between the first and second fixed parts 112 and 114 to house the busbar 110, the circuit board 120, etc. The shape of a cross section perpendicular to the longitudinal direction of the busbar 110 is a shape of a flat board bent at its at least one end.