To provide a highly efficient piezoelectric actuator-driving circuit for selecting the needles of a knitting machine, capable of reducing the loss of an electric current due to electric current-limiting resistance and the loss of switch elements as much as possible.

In this piezoelectric actuator-driving circuit for selecting the needles of a knitting machine, a curving movement is generated by using a laminate type piezoelectric member having a three terminal structure and applying a driving signal between a grounding electrode G and one of the first and second driving electrodes A, B. Therein, series circuits (Q1+LA and Q3+LB) for switch elements (for example, transistors) and induction elements (for example, coils) are connected between the first and second driving electrodes A, B and an electric source +VCC, and a switch element-driving control means (for example, a transistor driving-control circuit 90) for on-off control in a sufficient short time based on the time for driving the piezoelectric actuator is disposed.