An example magnetoresistive element includes a nonmagnetic conductive layer; a first magnetic layer connected to the nonmagnetic conductive layer; a second magnetic layer connected to the nonmagnetic conductive layer so as to be distant from the first magnetic layer; a third magnetic layer connected to the nonmagnetic conductive layer so as be distant from the first magnetic layer; and first to third magnetic electrodes connected to the first to third magnetic layers respectively. A voltage is applied between the third magnetic electrode and the first magnetic electrode through the third magnetic layer, the nonmagnetic conductive layer, and the first magnetic layer, and a current is caused to flow between the third electrode and the second magnetic electrode through the third magnetic layer, the nonmagnetic conductive layer, and the second magnetic layer. The nonmagnetic conductive layer decreases in volume toward the one end face.