In a position detecting apparatus 1 of the present invention, magnetic resistance circuits A and B of a first main circuit 10 include a reference magnetic resistance element +A, an even harmonic correction magnetic resistance element +A 3, being placed at a position shifted by (1 / 4)lambda or (3 / 4)lambda from the reference magnetic resistance element +A, with respect to a reference wave, and a third harmonic correction magnetic resistance element +A 2, being placed at a position shifted by (1 / 6)lambda from the reference magnetic resistance element, with respect to a reference wave, and magnetic resistance circuits A' and B' of a second main circuit 20 include the magnetic resistance circuit of the second main circuit 20 includes a reference magnetic resistance element +A' 1, a fifth harmonic correction magnetic resistance element +A' 2, being placed at a position shifted by (1 / 10)lambda from the adjacent magnetic resistance element, with respect to a reference wave and a fifth harmonic correction magnetic resistance element +A' 2, being placed at a position shifted by (4 / 15)lambda from the reference magnetic resistance element +A' 1, with respect to a third harmonic wave.