the present invention provides a voltage booster circuit for effectively supplying a boosted voltage of a stable level despite of small area . the voltage booster circuit of the present invention includes : an oscillator for generating a basic pulse signal ; a phase divider for dividing a frequency of the basic pulse signal to output a plurality of pulse signals having predetermined phase difference ; a first to a fourth charge pumps for outputting a boosted voltage in response to a correspondent pulse signal among the plurality of pulse signals ; and a drive controller for controlling the oscillator to maintain the boosted voltage to have a desired level .