Provided is a multiplexer that has a duplexer and that has a bandpass filter that is not the duplexer. The duplexer has filter characteristics wherein attenuation is greater at the passband of the other bandpass filter. The multiplexer is arranged upon a mounting substrate 14. The multiplexer has a duplexer 2A that is configured from first and second bandpass filters 3A, 3B and also has at least one bandpass filter that is not the duplexer 2A. The first and second bandpass filters 3A, 3B have respective first and second laminate bodies 11A, 11B and are configured as separate members. The configuration of the first laminate body 11A and the configuration of the second laminate body 11B differ in such a way as to make the frequency range of higher-mode spurious that occurs at the duplexer 2Adifferent from the passband of the bandpass filter that is not the duplexer 2A.