A position sensor comprising: a coil section including a plurality of layers of flat coils that are stacked on each other and connected in series with each other to form a single coil pole, the coil pole being energized by an A.C. signal, said coil section being provided by printing the flat coils on a plurality of printed circuit boards (P1, P2, P3) stacked on each other; and a magnetism-responsive member disposed to be opposed to the coil pole in a non-contact manner; wherein a relative position between said coil section and said magnetism-responsive member is caused to vary by displacing at least one of said coil section and said magnetism-responsive member in response to a position to be detected, a positional relation between said coil section and said magnetism-responsive member varies in response to variation in the relative position, to cause impedance variation in the coil pole, and said position detection signal is provided on the basis of an output signal, responsive to the impedance variation, taken out from the coil pole, characterized in that each of the layers of flat coils of the single coil pole comprises a plurality of flat coils disposed in a horizontal arrangement on a respective one of the plurality of printed circuit boards, and the flat coils of each of the layers are connected in series, the magnetism responsive member is mounted on a rotation shaft provided for transmitting rotation of an object of detection position, the magnetism responsive member being rotatable together with the rotation shaft relative to the plurality of printed circuit boards (P1, P2, P3), and the plurality of printed circuit boards (P1, P2, P3) each have an opening for passage therethrough of the rotation shaft. a coil section including a plurality of layers of flat coils that are stacked on each other and connected in series with each other to form a single coil pole, the coil pole being energized by an A.C. signal, said coil section being provided by printing the flat coils on a plurality of printed circuit boards (P1, P2, P3) stacked on each other; and a magnetism-responsive member disposed to be opposed to the coil pole in a non-contact manner; wherein a relative position between said coil section and said magnetism-responsive member is caused to vary by displacing at least one of said coil section and said magnetism-responsive member in response to a position to be detected, a positional relation between said coil section and said magnetism-responsive member varies in response to variation in the relative position, to cause impedance variation in the coil pole, and said position detection signal is provided on the basis of an output signal, responsive to the impedance variation, taken out from the coil pole, characterized in that each of the layers of flat coils of the single coil pole comprises a plurality of flat coils disposed in a horizontal arrangement on a respective one of the plurality of printed circuit boards, and the flat coils of each of the layers are connected in series, the magnetism responsive member is mounted on a rotation shaft provided for transmitting rotation of an object of detection position, the magnetism responsive member being rotatable together with the rotation shaft relative to the plurality of printed circuit boards (P1, P2, P3), and the plurality of printed circuit boards (P1, P2, P3) each have an opening for passage therethrough of the rotation shaft.