A magnetic sensor circuit comprising: a magnetoelectric conversion element having a plurality of terminals (HS1-HS4) including at least a voltage supply terminal to which a drive voltage (Vdd) is applied, and a ground terminal; a switch circuit configured to output signals provided from any two of the plurality of terminals as a differential voltage; a first resistor (R1, R2) having a first temperature characteristic; a current supplied from the voltage supply terminal flowing to the ground terminal through the first resistor and the magnetoelectric conversion element; a reference voltage generator having at least two types of resistors different in temperature characteristic from each other for generating a reference voltage, wherein the reference voltage generator includes: a resistor having the first temperature characteristic, and a resistor having a second temperature characteristic being a temperature characteristic different from the first temperature characteristic, characterised in that the resistor having the first temperature characteristic, and the resistor having the second temperature characteristic are connected in series to a path for a current applied to the reference voltage generator, and a voltage between the resistor having the first temperature characteristic and the resistor having the second temperature characteristic is generated as the reference voltage; an amplifier circuit configured to amplify the differential voltage provided from the magnetoelectric conversion element and to output a post-amplification signal being the differential voltage amplified; and a comparator configured to compare the reference voltage provided from the reference voltage generator and the post-amplification signal provided from the amplifier circuit to output a comparison result. a magnetoelectric conversion element having a plurality of terminals (HS1-HS4) including at least a voltage supply terminal to which a drive voltage (Vdd) is applied, and a ground terminal; a switch circuit configured to output signals provided from any two of the plurality of terminals as a differential voltage; a first resistor (R1, R2) having a first temperature characteristic; a current supplied from the voltage supply terminal flowing to the ground terminal through the first resistor and the magnetoelectric conversion element; a reference voltage generator having at least two types of resistors different in temperature characteristic from each other for generating a reference voltage, wherein the reference voltage generator includes: a resistor having the first temperature characteristic, and a resistor having a second temperature characteristic being a temperature characteristic different from the first temperature characteristic, characterised in that the resistor having the first temperature characteristic, and the resistor having the second temperature characteristic are connected in series to a path for a current applied to the reference voltage generator, and a voltage between the resistor having the first temperature characteristic and the resistor having the second temperature characteristic is generated as the reference voltage; a resistor having the first temperature characteristic, and a resistor having a second temperature characteristic being a temperature characteristic different from the first temperature characteristic, characterised in that the resistor having the first temperature characteristic, and the resistor having the second temperature characteristic are connected in series to a path for a current applied to the reference voltage generator, and a voltage between the resistor having the first temperature characteristic and the resistor having the second temperature characteristic is generated as the reference voltage; an amplifier circuit configured to amplify the differential voltage provided from the magnetoelectric conversion element and to output a post-amplification signal being the differential voltage amplified; and a comparator configured to compare the reference voltage provided from the reference voltage generator and the post-amplification signal provided from the amplifier circuit to output a comparison result.