PURPOSE: To mount a resistor for detecting current by allowing accurate detection of a current value.

CONSTITUTION: A resistor 4 for detecting current is connected between a power source side terminal 1 provided in the course of a current path being divided and an earth side terminal 3. Both end parts of the body 4a of the resistor are screwed down on a casing 5 through an insulating body 6 and screw linked to the pair of terminals 1 and 3 with a screw 8a and a nut 8b at a part inward from both the screwed down part. In this manner, the link between the terminals 1 and 3 and the resistor is made by a mechanical contact to eliminate changes in the resistance value attributed to a difference in the amount of solder as could be generated by soldering thereby enabling the detecting of a current value accurately.