A position detection device comprising: a coil section; a target section whose relative position to the coil section varies in response to a position of a detection object, said target section including a magnetism-responsive member constructed to cause the inductance of a coil included in said coil section to vary in accordance with the relative position; a self-oscillation circuit comprising the coil included in said coil section and a capacitor (14, 15), said self-oscillation circuit having the coil, included in said coil section, incorporated therein as an inductance element for self-oscillation; and an output circuit (21, 22, 23) that is adapted to output position data of the detection object based on an oscillation output signal of said self-oscillation circuit, wherein said output circuit (21, 22, 23) is configured to extract an amplitude level of the oscillation output signal of said self-oscillation circuit and output the extracted amplitude level as the position data of the detection object, wherein said self-oscillation circuit has its oscillation frequency set at 1 MHz or higher, characterized in that said coil section includes at least one pair of coils (4a, 4b, 4a', 4b'; 41 - 44, 41' - 44'), including said coil, disposed at a predetermined interval from each other, said target section is constructed to cause respective inductance variations of two coils, constituting one pair of the at least one pair, to present mutually opposite characteristics, and said self-oscillation circuit is adapted to connect the two coils, constituting said pair, in series with each other and to output the oscillation output signal of the self-oscillation circuit from a connection point between the two coils. a coil section; a target section whose relative position to the coil section varies in response to a position of a detection object, said target section including a magnetism-responsive member constructed to cause the inductance of a coil included in said coil section to vary in accordance with the relative position; a self-oscillation circuit comprising the coil included in said coil section and a capacitor (14, 15), said self-oscillation circuit having the coil, included in said coil section, incorporated therein as an inductance element for self-oscillation; and an output circuit (21, 22, 23) that is adapted to output position data of the detection object based on an oscillation output signal of said self-oscillation circuit, wherein said output circuit (21, 22, 23) is configured to extract an amplitude level of the oscillation output signal of said self-oscillation circuit and output the extracted amplitude level as the position data of the detection object, wherein said self-oscillation circuit has its oscillation frequency set at 1 MHz or higher, characterized in that said coil section includes at least one pair of coils (4a, 4b, 4a', 4b'; 41 - 44, 41' - 44'), including said coil, disposed at a predetermined interval from each other, said target section is constructed to cause respective inductance variations of two coils, constituting one pair of the at least one pair, to present mutually opposite characteristics, and said self-oscillation circuit is adapted to connect the two coils, constituting said pair, in series with each other and to output the oscillation output signal of the self-oscillation circuit from a connection point between the two coils.