Magnetic field sensor device

Provided is a magnetic field sensor device (1) having a sensor section (100) which includes a magnetic impedance element (110) having a magnetic noncrystalline structural body. The electromagnetic sensor device has, in the longitudinal direction of the magnetic noncrystalline structural body, bar-like core sections (130, 131) which lead a magnetic field to the magnetic noncrystalline structural body. The core sections (130, 131) may be arranged on the both sides on the magnetic noncrystalline structural body in the longitudinal direction. The core sections (130, 131) may be arranged so that the longitudinal direction of the magnetic noncrystalline structural body and the longitudinal direction of the core sections (130, 131) are on the same straight line. The magnetic field sensor device may include environmental magnetic field offsetting means (140, 141) which generate a correction magnetic field that offsets an environmental magnetic field inputted to the magnetic noncrystalline structural body.