A mounting structure for a current sensor is provided. The current sensor is arranged between a negative terminal of a battery and a grounding unit. The mounting structure includes a battery grounding cable which has one end connected with the negative terminal of the battery, and a fixing unit which is electrically conductive to electrically connect other end of the battery grounding cable with the grounding unit. The fixing unit and the battery grounding cable constructs a current path which connects the negative terminal with the grounding unit. The current sensor is fixed by the fixing unit to the grounding unit, and disposed to detect current flowing through the fixing unit.