Patent ID: 6937010

Claim:
A magnetic detector comprising: magnetic resistance elements of which resistance value changes in response to change in magnetic field generated by rotation of a multi-polarized rotor; an IC formed by integrating said magnetic resistance elements and a signal processing circuit section that outputs a signal corresponding to multi-polarization of said rotor based on change in resistance values of said magnetic resistance elements; a lead frame on which said IC is mounted at one end on the side of said rotor, and to which an external output terminal for outputting an output signal from said signal processing circuit section to outside is connected at the other end; a magnet applying a bias magnetic field to said magnetic resistance elements; and a magnetic guide functioning to correct a direction of lines of a magnetic force that is generated from said magnet; wherein said IC, said lead frame and said magnetic guide are preliminarily assembled to form an integral one unit serving as a first assembly, and said magnet and said external output terminal are preliminarily assembled to form an integral one unit serving as a second assembly.