A magnetic sensor circuit includes a vertical-magnetic-field sensor, a horizontal-magnetic-field sensor, a control circuit controlling a first measurement mode and a second measurement mode through switching, a first feedback circuit configuring a feedback loop of a first operational amplifier, a second feedback circuit configuring a feedback loop of a second operational amplifier, a connecting circuit, and at least any one of a first switch switching an impedance of the first feedback circuit, a second switch switching an impedance of the second feedback circuit, and a third switch switchingan impedance of the connecting circuit those which controlled by the control circuit. The magnetic sensor circuit detects magnetic fields in nearly the same two-axial sensitivity without using a magnetic converging plate while reducing an occupation area of the amplifier circuit.