Current sensor, current measuring module, and smart meter

A current measuring module, comprising:

• an electronic substrate module;
• a current sensor fixed on the electronic substrate module;
• and
• a wiring line whose position relative to the electronic substrate module is fixed,
• the wiring line is configured that the current-to-be-measured flows in the wiring line,
• the current sensor comprising:
• a plurality of magnetoresistance elements whose resistance value changes by application of an current-induced magnetic field from a current-to-be-measured;
• and
• a selection circuit that selects one magnetoresistance element from these plurality of magnetoresistance elements and outputs a signal of a selected magnetoresistance element, and
• in the plurality of magnetoresistance elements, relationships between a magnitude of the applied current-induced magnetic field and the resistance value being different from each other.