A multi-band antenna switch circuit including a
diplexer connected to an antenna terminal for demultiplexing signals of different passing bands, a first and a second switch circuit for switching a
high frequency signal and a
low frequency signal demultiplexed by the
diplexer to a plurality of transmission / reception terminals, a first and a second
low pass filter connected to a transmission path between the
diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal, and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit. The multi-band antenna switch circuit includes a
high pass filter having an input terminal and an output terminal and provided at least between die diplexer and the antenna terminal and including a first
inductor connected between the input terminal and the ground, a first
capacitor connected between the input terminal and the output terminal, a second
inductor connected to the output terminal, and a second
capacitor connected between the second
inductor and the ground.