To provide an astable multivibrator equipped with a voltage-controlled oscillator whose frequency is stable even at wide-range output frequency control.

In the astable multivibrator having amplitude clipping elements Q3 and Q4 connected to load resistances R1 and R2 constituting the astable multivibrator in parallel through a control circuit Q10, the clipping elements Q3 and Q4 have fed currents controlled by the control circuit Q10 to control an output frequency.