An improved boot-strap type signal generating circuit having a small input capacitance and operable stably is disclosed. The signal generating circuit comprises a capacitor, a buffer circuit for generating a buffered signal in response to an input signal, the buffered signal being applied to one end of the capacitor, a delay circuit for generating a delayed signal of the buffered signal, the delayed signal being applied to the other end of the capacitor, and an output transistor having a gate connected to the one end of the capacitor.