To provide a frequency-dividing circuit for stably generating a pulse signal for generating a sawtooth wave signal having a frequency of one third of the frequency of an input signal.

A T-flip-flop 21 inverts an output state in synchronization with the rising edge of a pulse signal B generated by an oscillator 10. A T-flip-flop 22 inverts an output state in synchronization with the rising edge of a logical signal C outputted from a Q_terminal of the T-flip-flop 21. An OR circuit 26 outputs the OR of the logical signal C and the logical signal D outputted from the Q_terminal of the T-flip-flop 22. A delay circuit 27 generates a delay signal E by delaying the rising edge of an output signal of the OR circuit 26. An AND circuit 28 resets the T-flip-flop 21 by utilizing the delay signal E. The pulse signal obtained by inverting the logic of the delay signal E is given to a sawtooth wave generation circuit 30.