A surface acoustic wave demultiplexer includes a first surface acoustic wave filter, a second surface acoustic wave filter having a higher center frequency than the first surface acoustic wave filter, and a one-port surface acoustic wave resonator connected to an input terminal of the first surface acoustic wave filter in series and having an anti-resonant frequency in the stop band of the first surface acoustic wave filter. A first piezoelectric substrate that constitutes the first surface acoustic wave filter and a second piezoelectric substrate that constitutes the second surface acoustic wave filter are made from different piezoelectric materials.