To freely control secondary distortion in a secondary distortion control circuit such as an inverting amplifier constituted by using a non-linear resistance.

In this distortion control circuit, a combined resistance R12 which is formed on an integrated circuit substrate and constituted by serially connecting two kinds of resistances R1 and R2 whose non-linear coefficients are different is connected between a Vi input terminal and the inversion input terminal of an operational amplifier OP11. Also, a combined resistances k.R21 constituted by serially connecting resistances k.R1 and k.R2 having the same resistance ratio as the ratio of the resistances R1 and R2 is connected between the inversion input terminal and a Vo output terminal. At that time, the positions of the two resistances are changed or the ratio of each resistance is changed in each combined resistance R12 and k.R21 so that the secondary distortion of the operational amplifier OP11 can be freely controlled within a fixed range.