To provide a triplexer that has a small size and low profile and satisfactory characteristics in a simple circuit.

The triplexer comprises: an input port P0; a first port P1 for outputting a signal in a first frequency band f1; a second port P2 for outputting a signal in a second frequency band f2 higher than f1; a third port P3 for outputting a signal in a third frequency band f3 higher than f2; a first filter 11 causing the signal in f1 to pass therethrough; a second filter 12 causing the signal in f2 to pass therethrough; a third filter 13 causing the signal in f3 to pass therethrough; and a matching capacitor 10 causing the signals in f2 and f3 to pass therethrough but cutting off f1. The first filter, the second filter and the third filter are connected between P0 and P1, between P0 and P2 via the matching capacitor and between P0 and P3 via the matching capacitor, respectively.