A magnetic sensor device comprises a thin film first magnetic body provided with a magnetic path convergence/divergence section arranged on a predetermined axis, and at least a pair of wing-shaped sections extending from the magnetic path convergence/divergence section toward the opposite sides of the axis, a thin film second magnetic body provided with a magnetic path convergence/divergence section arranged on the predetermined axis to be spaced from the magnetic path convergence/divergence section of the first magnetic body, at least a pair of wing-shaped sections extending from this magnetic path convergence divergence toward the opposite sides of the axis, a first coil wound around the first magnetic body, a second coil wound around the second magnetic body, and a magnetoresistance effect element arranged between the magnetic path convergence/divergence section of the first magnetic body and the of the second magnetic body, wherein the first coil applies a magnetic field to a magnetic path of the first magnetic body, the magnetic path converging/diverging from/to the at least a pair of wing-shaped sections of the first magnetic body to/from the magnetic path convergence/divergence section the second coil applies a magnetic field to a magnetic path of the second magnetic body, the magnetic path diverging/converging from/to the magnetic path convergence/divergence section to/from the at least a pair of wing-shaped sections of the first magnetic body, and a magnetic field is applied to the magnetoresistance effect element along the converged magnetic path.