A current detector having a linear conductor 111, 112, a linear to-be measured conductor 10 disposed substantially in parallel to the conductor 111, 112 and through which a to-be measured current flows. A Hall element 20 disposed in the vicinity of the to-be measured conductor 10 such that a magnetic flux generated by the to-be measured current flowing through the to-be measured conductor 10 enter into a magnetic-force sensing face 21 substantially perpendicularly. A substrate 30 for supporting the conductor and the to-be measured conductor 10 such that the magnetic flux generated by a current flowing through the conductor becomes substantially parallel to the magnetic-force sensing face +21 in the magnetic-force sensing face 21 of the Hall element 20.