<p>A spread spectrum signal demodulation circuit includes a multiplier which multiplies an inputted spread spectrum signal by a demodulation PN code, and a demodulation PN code generator generates the demodulation PN code by utilizing an oscillation signal from a VCO as a clock signal thereof. An output of the multiplier is given to a bandpass filter and an output of which is integrated by an integration circuit. A first integrated value for a first time is compared with a second integrated value for a second time later than the first time and, in accordance with a comparison result, a frequency of the oscillation signal of the VCO is changed so that the demodulation PN code is synchronized with a modulation PN code included in the inputted spread spectrum signal.</p>
